What subs do you think will pair up best?

Do you mean pair up with another subwoofer or a particular speaker?

Bill

It dep...whoops. Velodyne DD18, because it has so many adjustments and can be taylored to the room.

Like it's been already said, this is kind of an open-ended question. We need more specifics. So, of course it's going to depend. You got what you asked for! :)

A pair of DD18's are great as well as a pair of JL Audio F113's. These were the two front runners when demoing. Extremely safe bet IMO!

Yes, they will. Honestly, you need to give us more information... pair up with what? And what are you going to use them for? Home theater, music, both? What is important to you? Very deep bass? Accurate bass?

This is kind of like asking which car is best? Well, the correct answer IS "it depends"... are you going to use the car on the track only? Are you moving 400 lbs of mulch? Do you have 5 kids? Are you driving only a handful of miles to and from work?