JL is good. That's what I used to run. I just my four 12's. They are a good all around subs, but they tend to wear out kinda fast, then you start losing numbers. That's the only down side I see to them.
Your right, everyone has they're own opinion. I ain't tryin to start shit. I have just never seen anything worth a shit from fosgate, except for they're fleet of ex cab daks with the wall of 10's in them. those were pretty fuckin sweet. And I know how to build a box, my personal best ws with four JL 12's hittin a 160.4 legal on the dash. got the trophy to back it.
RE are awesome. I heard their XXX15"s were having a little problem with higher freq of bass..but the 12"s and 10"s are awesome. They handle alot of power which means you can slap a monster amp on'em and still put'em in a ported enclosure. All those companies y'all named are all good companies, I've had'em all. It all depends on who you've been dealing with for years and who you haven't. my opinion..
JL: good sound quality
RF: For the bass heads