You can find that plasma for $100-200 cheaper online (check out pricegrabber.com). As long as your room isn't huge, you can get a nice SVS, Hsu, or Onix surround package (5.1) for under $1000. Then top it off with one of Pioneer's, Onkyo's, or Yamaha's receivers that cost ~$250. Bottom line: if you don't mind increasing your budget by a few hundred dollars, I think you could get a fairly nice system for around $2500.
...If that sounds good, let us know and we can give you some specific model numbers along with websites where you can buy the items at lower prices than in stores.