In my quest to put together a modest audio system/home theater, I've either purchased or decided on the following:

Receiver - Denon AVR-2803
Mains - Paradigm Studio 20 v.3
Center - Paradigm CC-470
Surrounds - Paradigm SA-10R

Now, I'm looking for a subwoofer. I'm not particularly enamoured with bass, but due to the size of my room (18' x 18' x 12') and the small size of my mains, I know I'll need one. My primary interest in a sub is one that is "musical" and accurate with minimal distortion. It doesn't have to go real low or real loud. My understanding is that a sealed sub is best for this. Agreed? Also, because of my three grandchildren, I want a downfiring sub. And finally, I would like a sub that is small to medium in size. Price limit - $750.

I recently entered into Google the words, "sealed downfiring" and pretty much all I came up with (aside from car subs) were the following speaker manufacturers:

1) ALAS12 and ALAS15 by Acoustech Labs
2) CLARUSX10200 and CLARUSX10150 by Creative Sound Solutions

So, has anyone ever heard of these companies and/or their subs? Any opinions?

Based on my needs/wants (small to mediumin size, accurate, dowfiring and <$750) can anyone suggest a sub for me?

Thanks for your help.