Need a good setup for under $400 / Please HELP! TY! (1 Viewer)

The room is 20 feet by 15 feet. I've got a TV with HDMI control, and a PS3. No cable box. Besides, my PS3 is all that matters, besides hooking up a future PC. So I guess I have to account for that too.
I'm looking to buy a surround sound system for under $400. Preferably $350 or less, but whatever.

• My absolute #1 main purpose for this is great sound for videogames and music.
• I rarely watch movies, but I do watch tv shows via Hulu and Netflix. Any movies will be either streamed or blu-ray.
• I'd like a powered subwoofer, and have heard that any system below 500 watts is a joke.
• I will buy wire and have someone splice it if need be.

Here are the systems I'm currently looking at:
$320 - Sony HT-SS370
http://www.amazon.com/Sony-HT-SS370-Surround-Theater-System/dp/B0035ER1QE/ref=cm_cr_pr_pb_t
$250 - Sony HT-SS380
http://www.amazon.com/Sony-HTSS380-Home-Theater-System/dp/B004K1EO7A/ref=dp_ob_title_ce
$360 - Panasonic SC-BTT195
http://www.amazon.com/Panasonic-SC-BTT195-Blu-Ray-Surround-Theater/dp/B0078GCLU6/ref=wl_it_dp_o_pC_S_T1?ie=UTF8&coliid=I3B7LTDWGY11Q4&colid=MRMRT7F4FOBE
Obviously the expert members here are the...experts. So please, if you're pretty good with this stuff, let me know what exactly I should be buying. Also, let's say there's this killer $200 system. Everything rocks except the bass. If purchasing a better subwoofer would still make the system less than $400 all-together, I would do it.
Thanks to anyone attempting to help, in advance.

Those Sony, Panasonic, Lg type htib systems are O.K. for what they are but seperate receivers and speakers are much better. How about a factory refurbished receiver and/or speakers? Much better value.
Onkyo SKS-HT540 The front three speakers are pretty decent and the subwoofer isn't that bad. Anf for $150 you can't go wrong. http://www.accessories4less.com/make-a-store/item/ONKSKSHT540/Onkyo-SKS-HT540-7.1-channel-Home-Theater-Speaker-System/1.html
Onkyo TX-NR509 http://www.accessories4less.com/make-a-store/item/ONKTXNR509/Onkyo-TX-NR509-5.1-Channel-3-D-Ready-Network-A/V-Receiver/1.html
You could also get a receiver/speaker package like the 7400 but I don't think the speakers are as good as those in thr HT-540. And that ain't saying much. It does have a little bit better receiver than the 509 but you probably don't need it.

Anything else I could look into? I'd rather the receiver come with the speakers.

Anyone else?

I agree with building your system over time. Buy a decent 5.1 receiver and at least the 2 front speakers to start. Then add sub, center channel and surrounds when you can.

As you start to expand, you will regret buying a compact HTiB.
Althought something like mccambly posted wouldn't be bad.
You might ask around here what are some receivers that people have that they like and look for a used receiver. Same even with the speakers. You could end up with a really nice system, but may not keep it at 400.
I had this receiver and recently gave it to my aunt for her basement.
http://www.amazon.com/Denon-AVR-887-7-1-Channel-Theater-Receiver/dp/B000HD0CB2/ref=sr_1_1?s=electronics&ie=UTF8&qid=1336070595&sr=1-1
A bit limited on HDMI, but you could buy a switch for that. More than powerful enough and a really strong unit.
You could then look at these speakers (posted this in another thread)
http://www.newegg.com/Product/Product.aspx?Item=N82E16882290211 (Center)
http://www.newegg.com/Product/Product.aspx?Item=N82E16882290205 (towers)
Drive your bass through those towers, you may not need a sub.
So that's 175 + 269 putting you a hair under 450. You could then get a cheap set of bookshelf speakers for your rear...and it'll sound better than those HTIB's that you were looking at. I know it's a bit more than you were lookign to spend, but it's not a bad setup. Not sure where you are from so sorry if this isn't something you can do. It's all about whatever you are comfortable doing. Hope this helps.