Well, I have a Brutus 1500 and I can tell you right now 0 gauge is not going to fit into the wire harness for the amp. The largest you can get in there is 4 gauge. However you can run the 0 gauge all the way to before the amp and run a distro block so you don't have to tear apart you car again for an upgrade.
About that amp kit, in general wire is wire. RCA's might matter a little, but power wire doesn't make a difference which name you get. So I would go for it, but you should get a distro block and like a foot of 4 gauge wire also to connect to the brutus.