not too sure about signal cables but at least for power Kicker Hyperflex is amazing stuff. Used to be pretty cheap for PKD1 kits on ebay for 1/0 wire, still cheap now but bit more pricey than it was. I have full kicker power/ground as well as RCA and speaker wires, but much of that was since I got it in good deals here and there as part of amp kits.
for the most part, wire is wire. Look into strand count and what the wire is made of, and aside from that, you cant go wrong.
with that said, the popular choices are ussually Knukonceptz KLM for budget wire (not too flexible), knukonceptz fleks cable (very flexible), kicker hyperflex, stinger's flex stuff (i havent used it though). The list goes on.....