Welcome!!!!!!!!!!!!!!!!!!
First off WELCOME to the site. This place is incredible and you will get a lot of information in here for sure.
One thing you will become aware of, a lot of people have preferences as to specific speakers and their sound. Understand that a large good quality floor standing speakers with say 8" drivers when driven hard will give you a more powerful sound than say that same manufacturer’s 6" floor standing speaker. I am sure you are aware of that it is just a statement, so you can kind of gather the scope of sound from speaker sizes. Also do not forget that the center channel and subwoofer are the 2 most important speakers to spend money on for HT. SO if your plan is to by now and have them for future HT (Home Theatre) then don't skimp on these two components.
Your room is not massive, how high are your ceilings?
The Set-up suggested here, you can guarantee, would be awesome. The Axiom speaker line has a lot of loyalty and garners high approval factors and review scores. I would recommend that you go out and invest some time and listen to as many speaker manufactures as you can. Also many manufactures offer a free in-home trial period. Axioms' is 30 days. I don't think they get a lot sent back to them. Just as an informational tool for you to do some searching, you could also check out av123.com, mirage speakers, Polk, svsubwoofers.com, who also are coming out with their own bookshelf speakers as well look in their news section on their website. These are just a few of the many manufactures that are out there. Again I suggest that you listen to as many as you can, then for the ones that you can not listen to, look up CUSTOMER reviews on the net. See what the people that have bought and have in their home think of the particular brand of speakers.
The recommendation on the subwoofer is hard to beat as well. The Rocket sub got a great review on this site as well. Again trust the information in the reviews on this site. These guys don't play around, if it is great they tell you, if it is good they tell you, if it is not, they tell you. You can also look at SVS, HSU, Velodyne and Axiom as well for a subwoofer. Again you would not be going wrong with the Rocket for sure. Just want you to be aware of other great contenders.
You may want to consider another receiver as when this article was written, HDMI switching was really not out. You may want to look at Yamaha, Denon, Pioneer, Marantz, Harmon Kardon, etc. all of them now offer HDMI (High Definition Media Interface) switching, basically a type of cable connection that carries High definition audio and video at the same time. The receiver manufactures above all have receivers that accept and transmit HDMI I believe.
As far as the system being too much, do you drive your car as fast as it will go ALL the time? No! Do you like to have power to pass though, sure you do!!!!!!!!!! It is not a question as to too much, as much as it is a question of what sounds good. Most all decent HT set-ups can be driven to intolerable decibel levels, and remove things from walls and shelves, and most of us (especially those with attached neighbors) never drive them that hard. But sometimes there is nothing quite like great sound cranked up, I am sure you know what I am talking about!!!!! So don't worry about too much, because you can never have too much good sound!!!!
I hope this helps you out, and again welcome!!!!!!