Since you want the subs for HT I recommend the cylindrical subs from SVS. They play very loud and very cleanly. No boominess at all. And, they don't cost an arm and a leg. They aren't the subs I would recommend for integrating with Maggies, for example, but for HT they are the best bang for the buck I know of. I have had one for about 1.5 years and couldn't be happier. I only use it for movies. My Soliloquy 6.5s are full range like your 10Ts and I continue to use them full range during movies. I only route the LFE channel to the sub.
You've got to hear the SVS on U-571. The depth charges will shake your chair. In my previous house my listening room was 22'x26' with 14' cathedral ceilings. One 39CS, their middle size which is tuned to 20Hz, was enough to shake the floor in that room. I once tried to see if I could hear any break-up by using the Bass Mechanic CD and increasing the volume while playing 20 to 40Hz notes. I gave out before the sub did. I couldn't stand it, it was so loud. There was a brick fireplace in the room that was flanked by drywall. The sub was causing the brick to rub against the drywall making some pretty scary noises. I must have excited the resonant frequency of the chimney!
They have a 45-day money back guarantee, not including shipping, so you don't have much to lose by trying them. Their web site is www.svsubwoofers.com. I have no affiliation with SVS, I'm just a very satisfied customer. I can't get over the amount of performance you can get from them for $500. If you want more opinions on these subs go to www.hometheaterforum.com and ask around. You'll find a bunch more SVS fanatics like I am.
