I like Velodyne subs, but I dont like the CT series that much. If you plan on spending 800-1000 I would go with the velodyne. If your going to spend 400-500 I would go with the HSU Research VTF-2.
Its a 10" down-firing sub and rated as high as some subs in the 1k range. Rated at 150 watts, the rating is very conservative. I have the sub volume set at 3 in a 12 x 12 room and its plenty loud without any boominess (is that a word?). Quick response for music. Nice and tight. Its rated down to 25hz. You can even contact Dr. Hsu in cali to help set up/placement. He will speak to you directly. www.hsuresearch.com.
Read the reviews at www.audioreview.com.
Also, read the reviews at www.soundandvision.com
(go to hot topics then bargain bassment) they review the top 5 subs under 500 dollars. The HSU and Mission were rated the best.
You can buy the HSU from www.jeffssoundvalues.com
for 425 plus shipping. You can pick up the mission from an e-tailor in Canada for under 400 US dollars.
I'm too lazy to link anything....(edited, someone else isnt...)
[This message has been edited by SoSpacey (edited January 24, 2001).]