Building a room - need audio advice

After having a home built over 3 years ago, I finally have the ability to build a room in the basement just for me. With that being said, I have to be budget conscious. The room will be roughly 12x24 with 8 foot ceilings. I intend to put a plasma in the middle of one of the 24' walls and would need to add a surround system, receiver, blu ray and a directv box. The plasma, tv and blue ray I have under control. But it has been many years since I have bought any type of surround systems and now seek advice.

My research so far has basically been cnet reviews and random forum reading. I like the idea of the Energy Take Classic 5.1 as I can mount everything to the wall and out of the way of a 2 year old. Floor speakers are out because of that. I've seen some mention that if I choose that system, I should only buy the sats and center channel, opting to purchase an ungraded Energy sub, but I can't seem to locate a way to make that purchase for $400. However, I am open to other options for wall mounted, semi small system for both movies and music. I listen to quite a range of things and I'd like the speakers to be able to handle movies as well as being able to play the music pretty loud when I want.

As for a receiver, I am completely lost. My old systems had CDand DVD players but this one will not. I'd like to be able to connect something like an ipod if needed. But I don't have an iphone or ipdad for the airplay function so that isn't important to me. I'd say that spending no more than $500 on the speakers and $400 on the receiver would be ideal.

I hope I've given enough info to warrant advice from you folks. I appreciate your feedback. Thanks.

With infinity set, would I need to match them somehow? I guess I've always gotten the impression that the premade sets are balanced and takes the guess work out of having to piece together a system for it to sound good?

No, it isn't going to be a dedicated room. I understand what you are saying about putting the set on the shorter walls but it doesn't work well for me. I would prefer floor speakers up front, but that wont work either. I may build everything in wall or RF if so everything is hidden and clean. I just want something that rocks without having to destroy my wallet. Building the room is going to be pricy enough.

So with the deals on Crutchfield, I can get the Infinity P162 for $85 each plus the PC350 for $200 more - $540 total. But I need still need a sub. Do you think this set would be good for my room at that price? What sub would fill these?