lets see so far i have had
some el cheapo brand 12's that i got at a box store like 9 years ago
JL 12 inch W0's
JBL 12's
JL W3
Infinity Kappa Perfect

I have been very happy with the Infinity i have now.
W3's slammed but werent the clearest sound ever. prolly the vented box tho.
W0s were good for what they were Loud but not too deep.
JBL i didnt like too much because they didnt last too long for me
El Cheapos yea i learned my lesson never to buy complete crap anymore