Sounds like you need this to function as a bedroom TV, normal TV setup, and PC setup, as if it was in a studio apartment.
I would put some thought specifically into a IPS type 1080p LCD TV so you get good viewing angles. You won't want to skimp here if it will be double duty as a PC monitor.
After that I would focus on a solid 2.1 setup for audio. A nice set of "softer" sounding bookshelves would be a good idea as you will sometimes be sitting very close to them. On a budget the new Pioneer's come to mind. Add a sub if your tastes need it, an inexpensive 10-12" Dayton or BIC would be fine for such a room. If you don't want to bother with a sub, you may be able to get by with a larger 6.5 - 8" bookshelf.
Sticking to a simple 2.1 audio setup (never 7.1 or more) means you can stick with an inexpensive receiver. I'd suggest a low end Onkyo or Denon that has Audyssey dynamic eq, which is nice to have for low volume listening. The receiver will give you the flexibility you need to set everything up for the smoothest use possible (TV/cable, xbox, PC, odd ipod or whatever here and there). Obviously, make sure it has a phono input. They are not always there these days.