Good to know someone had good experience with Rockford. Never met anyone that was remotely satisfied with them. I tried out a friends P3's and it didn't work at all for what I listen to. In their defense, however, I listen to mainly metal with lots of double bass/blastbeats and such. Rockfords simply aren't designed for that. And about JL, too damn expensive. Everyone has this idea cooked up in their heads that JL is the god of all audio companies, when that is not the case. If you have a big budget, go with Resonant Engineering or FI subs. They run about 250 a piece, but you get more than what you pay for. Diamond is also a very good company. My best friend has a D6 and it is a BEAST with good clean sound at the same time. If you're on a tight budget, I still say Alpine.