two 15's or four 12's?

Ok, i'm getting an 87 sub that's pretty much done, i just gotta clean up and tweak some stuff. Only thing it does'nt have (besides some door panels and stuff, lol) is a system. I have 2 audiobahn 12's with an audiobahn mono amp and a 30 band eq/crossover/driver and i love the way it sounds. Since i'm going to have more room now, should i go with 2 15's or 4 12's? It's pretty hard to find the audiobahn stuff like i have, i'd have to get all new stuff (i got my system back in '02), so what do yall suggest? I really like the way my system sounded, but i'm open to a different company. I've heard much good stuff about memphis, and since i'm only 3 hours from there, i'd be repping the south, lol. Hit me with some ideas and opinions.

thanks

I would say, make 2-12's sound like 4-15's. Less speakers, more bass is the key. That's how I roll.

1 15 ddaudio.com

the 2 12's are going to sound different in the burban than they did in the s10. I would do 4 12's. more cone area, and if you port them and give them enough power they will definatly outway the 2 15's any day.
15's are nice, but pwr. hungry, and really only good for deep low base.

go with the 12's, 15s are cool, but like it was said, only for supa low deep bass, so if listen to other music than bass mechanic, go with the 12s. Plus you have lots of room back there to make an awsome enclosure amp racks

YOU SHOULD GO WITH 4 12'S THEY HAVE A DEEPER BASS THEN 15'S HOW COULD I SAY THIS 15'S MISS A BEAT AND 12'S DONT