subwoofer project

This feel that I have read the very thread I am starting a countless number of times; my problem is that I have been planning an LLT for a few years now and during that time have selected several favorite drivers--only to see the manufacturer go out of business time after time! Avalanche, Sound...

I'm looking for suggestions for a 12" sub that will work well in no larger than 2.5 cf. There will be two subs and power for them can be supplied accordingly. The listen area is roughly 1100 cf. So what's on the menu today fellas and ladies.