You can get quality 5.1 for pretty close to $1000 but you may go over a bit with shipping but you'll have to give up the towers for a good sub. That rom isn't big enough to require towers as long as you have a sub. If you want 7.1 you can always add two more P152 later.
2x
Infinity P162 as mains $85ea shipped
1x Infinity PC250 center $150 shipped
2x Infinity P152 as surrounds $75ea shipped.
1x Hsu Research
VTF-2 MK3. $509 + S&H
Total $979 + $59S&H = $1038
Or if the total of the entire space including anything open to that room is less than say 2000cuft maybe an
Emotiva Ultra 12 sub (on sale for $429 shipped). It's smaller but but won't fill a huge room.