If the equipment rack has custom shelves or a furniture like finish, then this price seems very reasonable for the rack.
The following items seem very much in line with typical value, pricing, and requirements: Furman, AppleTV, Netgear, IR Emitters, Integra, HDMI splitter, speakers, AirPort.
Now, the items that I didn't mention aren't necessarily out of line, but they deserve some talking about.
1. The 18' HDMI cables are expensive. They likely offer good profit to the company, but there is some negotiating room there for sure. It may not seem like much, but they can use different cables that will work just as well. Perhaps buy your own cables and have them use them instead if they can't offer you something more reasonably priced.
2. The IR emitters are reasonably priced, but you actually have 12 pieces of gear that must be IR controlled? 3 TVs, Integra, AppleTV, and what else? Do you have a lot of existing A/V gear that you are trying to integrate into this system? That list actually matters because it affects the rest of stuff.
3. I'm not sure of their design, or your final goal, but the use of HDMI splitters can be very good, or very questionable. But, I would expect them to make sense and the price is in line with HDMI splitters which actually work reliably.
4. The wall mount is overpriced for a standard tilting wall mount unless it is a Chief model. If you have 3 TVs side by side, then I would probably go with the Chief LTMU mount, which is rightly priced at $279. These mounts offer fine tuning of the display height and leveling which means your final look is exactly perfect.
5. Materials budget is fine, perhaps even a bit low IMO, but it is fine.
6. The Savant gear is the control system to run the show. It isn't great, it isn't terrible, but you will want to do some research on whether or not that it TRULY what you want. As with all control systems, once you buy into it, you tend to stick with it for years. Savant is an advanced system similar to Control4, but it is template driven, which means that it is not programmed by installers, but by Savant, then it is 'configured' by the installers. It still requires expertise, but it is almost like a glorified Harmony remote. Does a lot more, is a lot smarter, but if you want to do something outside the box it can be difficult to achieve. Still, the price is in line with a quality control system. Especially with one which needs to control 12 IR devices.
7. Labor is questionable since you didn't really mention your scope of work. Which leads me to more questions...
You touched, very briefly, on your requirements, but you didn't really talk about what you have, and what you intend to do, and what you need others to do, and what your final goal is.
You own 3 TVs already?
What size are they?
What brand/make/model?
Where are they going? On drywall? Wood?
Is the installer going to wire in the new televisions?
Does wiring need to be done behind drywall?
Does speaker wiring need to be done?
Do the installers need to cut into drywall for other reasons?
What are your other sources? I only see two IR devices in the proposal (AppleTV/AV Receiver), so besides your 3 TVs, what are the other sources that need to be controlled?
What are your personal wishes for this system to do? Do you want any source to any destination? Do you want one touch switching from one device to another? iPad control? Hard button remote control?
I typically speak to people about how important hard button remotes are for the 'average' user to simply use a system, but your room is far more complex than that which may make it tough to keep simple, still, a single remote to use one display may make a lot of sense to have in the system.
Now, you need to keep the following in mind:
1. TAX IS NOT FOR THEM! Knock $1,130 of the price right now. You live in a state with a 8% sales tax and that is something that the installer doesn't get and is something you will be paying regardless of system.
2. It does appear that tax has been added to the entire amount, instead of just the materials portion. Typically labor is not taxed. You may want to ask them about this since that will knock $400 off. Look at the other proposals to see how things are taxed!
3. At $80 an hour, you have about 60 hours of labor associated with this installation. That seems to be in line with the amount of work required for a neat and clean final system. It may even be low depending on your expectations.
4. There is wiggle room. Bottom line is that if you go elsewhere and get pricing on the exact same gear, you can probably find it for less and you can negotiate. But, if these guys are GOOD, then they won't negotiate much before they just walk away. At some point profits become so low, that it doesn't make sense to take the project. How much you want to push price is up to you, but you can likely get another $500 or so off the price.
5. Equipment choice... Did they tell you why they chose that equipment? Is it appropriate for your space? Did they tell you why? Paradigm speakers aren't exactly cheap, but they are very 'family room' friendly. Is that what you want?
6. I would likely go with a different subwoofer, but that's because I think there are far better subwoofers out there that don't need to be from the same guys that make the speakers. Far more bang for your buck and likely won't be sold by the guy installing the system.
Did you have a budget in mind for things? I'm guessing you were thinking it would be about $10,000 maybe and that's what you were targeting for. If that IS what you were expecting, with the need to wire and hang 3 displays, get you a quality remote control system, and put in speakers and the rest then I would have to say it is unrealistic. I think that you may be able to do it for $15,000, but that the system that is listed is decent and in line with the money spent for a good A/V company. They SHOULD be a good A/V company though, and not a sales guy who doesn't really know what the heck he is talking about.