Dont cut corners on the wiring, you dont want to starve the system of power. I've mainly used 0 AWG wiring kits for my systems and they sound crisp and clear.
I had an old school Fusion amp previously which was rated at 1000w rms @ 2ohms and that thing would never heat up or cut out, plenty of power!
JL's do good amps but sometimes i feel their products are over priced. If you need a decent amp at a reasonable cost then i'd suggest the JBL brand.