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Like knewblewkorvette recommended visit knukonceptz.com or you can order from there ebay store. I have delt with these people at least 5 times ordering different stuff for different cars. If you dont see what you need shoot them an email
Streetwires is all I have ever used as far as powercables, sub wiring and speaker wiring go although I have used a few Rockford electrical components. Havent seen much reason to change.
Call me cheap, but I usually just go down to RadShak and buy their 8 gauge wire for power leads, and either make my own cables, or buy some mid level quality RCA cables. Radshak has pretty good 12 gauge audio cable for speakers, im sure its made by some big wire manufacturer without the label. But im cant say too much, I have some streetwires RCA's that someone gave me. I know it isnt the most kickass stuff, but scorche isnt too bad, and was always available locally when I needed to buy it at the spur of the moment.