crap...

help! I just bought some subs to get buy, but anyway i'm confused about wiring kits since I'd like to wire my amp myself (of course i can do it! ).

I keep seeing in the store like a 10gauge amp kits that only can go up to 100watts, but then online i see 10guage amp kits that go up to 800watts. Is there a trick here, is the one in the store just as good as the one online (they're both no name brand)??

BTW I have 2 12" Linear Audio's (generic i guess) a 400watt RkFsgt amp and a nice bandpass box.