Originally posted by: sheik124
They just don't want the bass to be too boomy, and its mainly for watching HD (things like CSI, the Super Bowl, etc.)
I've heard about the Pioneer 1014 and the fact that it was the internals of the 52, I forgot where I read about it though
EDIT: the room is about 15x12, but it only has three walls (the back is open to the kitchen)
Ok, that's not too big then

I was worried it might be like 20x25 with high ceilings or something. The larger the room the more efficient speakers you're going to need to fill it with good volumes.
HSU and SVS make excellent subs that could fit into your budget if you want them to. They will be powerful and wont be boomy.
Are you looking for a set of small speakers like the quintets or just whatever is a good deal?
Some subs to look at below the HSU/SVS lines might be
dayton 10" if you're looking for something under $225
For something more, a
JBL e250 could be a nice option.
Or, add a BFD to the dayton to flatten out the response of it and get nice cleaner bass from it.
Abover the $300 mark, I think it would be worth it to spend it on an SVS PB-10 or HSU STF-2.