I am very new to this and need some help in choosing a subwoofer for my system. The components so far are these:

Yamaha 6.1 100W receiver
Mirage Center Channel CC-1
Mirage Omnisat Micro surround speakers x2

The room size is small to medium (15' x 12' and is fully carpeted. The house is brick stone. I neither want or need a subwoofer that will shake the walls or floors - just something that will provide clear, crisp sound without alot of booming. It will be used to play music, DVD's and TV. I have been doing lots of research and found the following subwoofers - all rated five stars or just below on this web site. They are also very inexpensive, as subwoofers go, and I don't want to spend lots of $$$. The list includes:

(1) BIC America V-1020 10" (350W) Down Firing Subwoofer - $160-$200
(2) BIC America V-815 8" Powered SW with Long Throw (150W) $139.00
(3) Acoustic Research PR808 8" (150W) - $109
(4) Velodyne VRP-1000 10" (170W) $120-$250
(5) Velodyne VX-10 !0" (150W) $100-$170

QUESTIONS:
How much watt power would I need for the smallish system I have? I am leaning heavily toward #5 - Velodyne VX-10 - 5 stars from 11 users at tomshardware.com: http://stores.tomshardware.com/ratin..._type=masterid

Would this be enough power? Does anyone here have experience with it? Thanks.