what amp and crossovers for 8 speakers??

[gmdubz23]

Okay so I have a set of rockford fosgate 3" two way speakers up front in the center in the headliner (confusing I know) they both are right above the dome light. I also have a set of jl 5 1/4 speakers on the back deck behind the backseat and my 4 door speakers are off brand 6x8's.

Speaker specs-

(2)RF 3" FRC1203- 30w each (2=60watts)

(2)JL 5.25 TR600-cxi-100w each (2=200watts)

(4)scosche HD 6x8-250w a pair (4=500watts)

My questoon is should I run all of these of one amp or should I have seperate amps. And can anyone recomend a good crossover for these?

Jl says there is already a crossover on there speakers but could I add one too it?

Sorrif this is really confusing I'm doing my best. I want my car to sound like a studio being I have all these speaker that I can't even hear over my two rockford 15's lol

Thanks!