for power wire, use 4 gauge from the battery to a distribution block close to the amps... run a short 4 gauge feed to the 5 channel amp... and a short 8 gauge lead to the small amp. As close as you can to the battery, you'll need a fuse... Stinger uses Maxi or ANL (wafer) fuses with those amps you'll probably want a 100 amp fuse, which means you need the ANL type and a holder. There are plenty of battery terminals available that will make connecting the 4g power wire to the battery easier. Check their website or ask your dealer for options.
Properly ground both amps to the same place using the same gauge wire as the power, and keep the grounds as short as possible.
For RCA's you can use one of the 4 channel cables, and one 2 channel cable... use the 4 channel for the front/rear speaker signals and the single cable for the sub input on the amp. Before the amps, you'll have to split the SUB signal with a "Y" connector, run one pair into the 5 channel sub input and the other pair into the small amp for your "front subs". Also, at this time, run a remote turn on wire from the deck to the amps...
For speaker wire, 14g or 16g is plenty... its a little hard to run 12g wire and keep things neat looking, plus its too bulky for under the carpet.
if you need anymore info,
sumkidwithacl@aol.com is my addy...