You probally want a kit that has 4 gauge wire if the amp is puttin out 500 watts, but you could get away with 8 gauge if its under that. If you got a manual with your amp see what gauge it recommends and use that. The kits at walmart are okie. The power and ground wire is basically all the same for all kits(just different gauge sizes), i say they are okie because of the rca's, go with a name brand company for your rca's, something half decent.