When I say acoustical treatment, I speak of stuff that doesn't LOOK like acoustical stuff. I'm not suggesting that you install acoustical panels and stuff, but rather a good, heavy rug (if you have wood floors), some heavy drapes, and bookshelves. These are good for managing sound while remaining functional and aesthetically pleasing. Plus, if you let the wife choose the colors and such, it should make her a little more accepting of your other purchases (no guarantees here though).
When I said low range, I was talking about the 500-1000 or 1000-1500 increase. Usually when speakers are upgraded in this range, you're going to see an increase in the size of the driver (for better bass response) and if it's an HT set, then perhaps a subwoofer upgrade.
If you wanna continue doing some research, I suggest that you look into:
PSB Speakers Note: the link is only to the Image series, because that's probably as high as you'd go in their speakers lines.
Paradigm
Energy Speakers
Polk Audio
Magnepan
You'll note the large number of Candian speakers on the list. Well, that's because they're good! Also, PSB, Axiom, Paradigm (and I think some others) are all rooted in the research of the NRC, a group that focuses on a combination of measurement and listening to test their speakers.
Do you have a power conditioner or at least a surge supressor? You really need one of these to protect your system! A Tripp-Lite product should fit the bill nicely without breaking the bank.
HTPowerBar10
HT10DBS
IsoBar6DBS
If you don't want to spend that much, you should at the very least have a surge supressor so your electronics don't fry during a thunderstorm.
Another thing for the budget would be cables. You shouldn't have to spend too much on them though. I would recommend looking at products from
Blue Jeans Cable or
Impact Acoustics. Of course, you may already have cables and this wouldn't be necessary.
It looks like your TV is good for now. Since you have a PS2, I would recommend running an optical digital cable for sound and component for video. This'll reall allow you to get the most from the system.
All of the speaker manufacturers I listed should also have dealer finders so you can find dealers in your area. You should try to get into some shops and audition some speakers to get a feel for what you like and what you might be looking at for a price. In all honesty, the best way to shop for speakers is to go out and hear them for yourself. Just be aware that dealers may try to sell you some snake oil in the form of cables and such.
I guess I should try to give you a budget. I would say that your should spend no more than $2000 on speakers, but preferably less. You can get plenty of quality and power for the size of your room in the 1500-1700 range. Hell, you can even go below $1500. Just take some time to audition various setups and find what you like.
Sometime I'll try to throw out some more advice. But right now, I've gotta go. Good luck!