2 amps:

PPI art series A600 = 600 watts bridged mono 2x150 stereo

it pulls a LOT of current

PPI art series a204 25watts x 4 - doesn't sound like a lot, but its plenty loud...

I don't know what iasca recommends, I haven't been actively doing the car stereo thing for a few years now, but I'd normally use 8 gauge for up to about up to 250 watts.