After seeing your room here are my suggestions
Build a 4.1 system with a pair of small subs. If you can get a couple of DIY ones together that would be ideal. I wish I were experienced enough to build you a JL Audio 8w7 at this point. I know that type of build would be amazing and easily fill your room with LFE.
Your sitting on axis with the tv so you don't need a center speaker. Most low end Center speakers suck anyway and you'd be better off putting your money in the LR channels than in the center channel at your budget level. Center channels can be more trouble than their worth in many rooms.
Get a brand that you can match with speakers in Japan!
I know there was the EMP plug from a certain member.
Read this post before you buy EMP and then choose for yourself.
http://www.drmarksays.com/?p=71
In that post is a very discouraging review of them. Not to bash any EMP readers. I suggest if you own EMP speakers you not read that post.
This guy is very well respected here and is far more knowledgeable than me on loudspeakers. So I trust his opinions. Ultimately it's your ears anyway.
You don't have to choose right away so take your time.