Alright. Alright. First of all, that's a decent room size for a home theater. Second, although movies is the number one thing for you right now, you never know what you will like in the future--especially if you are lucky enough to have experience truly great speakers
So this is my recommendation for you:
Speakers ($2,820 from digitalcraze includes S/H):
Left & Right Main--Definitive Technology BP7002 (has built in 12" Powered 300-watt subwoofer)
Center--Def Tech CLR2500 (has built-in 8" Powered 150-watt subwoofer)
Surround Left & Right--Def Tech StudioMonitor 350 (built-in 10" Passive subwoofer)
Receiver: Onkyo SR805 for $800 (J&R Music World Free S/H)
Total = $3,620
After you listen to these speakers, you may just become a music fan.