Ive always had bad luck with the infinity Subs...Sound awsome, pound, but Ive blown 2 running them at nominal power and air space with a sealed box.

If you want to spend that kinda of money on a woofer, you can't beat the over all pound per dollar factor of a SoloBaric Squre, but I too have had strange luck with those. The dust caps would keep comming loose and rattling after a few weeks of hard usage.

Another woofer that ive had 0 problems with is the Kicker Comp VR's, Cheap, pound, and havent blown one yet

and if you want to go DIRT cheap...

AudioBahn stuff on ebay is the over all best bang for your buck, as long as you get their higher end woofers. Their low end stuff is garbage.