I wouldn't go any lower than 4 gauge. If I remember corectly your not running that much power, 8 Gauge wire is probably fine. But that being said you may be like me, the kind of person that puts a whole new shine on the word over-kill. Just saves time re-wiring it later if you ever upgrade to a much larger amp
I bought my Lightning Audio kit for $79, it was 4 gauge powre and ground, ring terminals, fuse, and fuse holder, wire loom, zip ties, etc it was pretty complete and it was good quality wire.
I should be able to pick up a amp install kit just like mine or of a simmilar level(Rockford Fosgate, JL, MTX, Street Wires, etc) at any sterio shop or you could check out Scala1 on E-bay and see what he's got.
Just as a refresher what amp are you running. I remember you are running AudioBahn subs, because we got into that debate about how wrong you were about sterio bass
L8ter,
Josh, aka the tireburner