A few hundos? Ah, no, if your looking for an amazing sub, save up about 5 hundos more , and wait until you can invest for about $675 -$850 and get a real subwoofer.
Hsu, Rythmic, SVS, Monolith, PSA, JTR all sell direct to you.
I have been reading about subwoofers for many months at AVS Forum:
These people are serious about subs, and you can learn alot from reading the threads.
They are going to want to know the exact dimensions of room and ceiling height .
Are you going to use this for double duty with hometheater? If so , maybe you would need a 15 inch woofer.? ($800-$1500)
Can you buy one subwoofer now and add a second one down the road?
Here is the Monolith, they do go on sale occasionally . Now it runs for $800.
a 12 inch woofer is the place to start IMHO if you want deep bass.
The Monolith will give you deep, tight, bass, and be thunderous for movies, but as you can see , serious subwoofers cost serious money.
Every other company I mentioned, the 12 inch subs will run about the same price.
Good luck to you.