I'll just chip in a temperance comment.
Unless you are investing thousands of $$$ and using very high power amps and speakers; high buck speaker cable is not required. 16 gauge generic wire is quite sufficient.
Don't chintz on terminals though. All connections should be soldered or use decent quality solderless connectors -- no twisty-ties!
As for power.. not much more to be said. I run two small amps (35rms x 2 and a bridged 80rms for my sub.) I ran 8 gauge to a barrier strip and 10 gauge cable to each amp. That's probably overkill, but I really hate electrical fires.