best amp for kicker comp vrs

I have two 4 ohm Kicker Comp VR subs in 12".  I currently have an amp that i am going to use on them and am going to wire them in series...  I am in need of a new amp however and am wanting your opinion on which one to get.   I have been looking closely at the JL 500/1 but im not sure how i should wire them for this amp.  Series??   or parallel??  Also, what is the best way to hook up 2 amps??  One will go to the subs and the other is a 4 channel to go to the door speakers in the truck.   Not sure if i should run to power wires, one for each, or run a 6 or 4 awg wire to the sub amp and then run a 8 AWG from the sub amp to the speaker amp....  Or is there another way that will work better??  They are going to be hooked to my factory head unit for now....Debating if and what after market receiver i want.....   Thanks for the help