I just ordered a large weatherack kit from Casper electronics. They have terminals capable of 12 gauge wire where Painless doesn't. The kit came with the terminal removal tool for like $75 bucks and included about 20 connectors and a bunch of terminals. I bought my crimper from American Autowire. It's a real GM tool and was pricey but works perfect. I'm sure Casper has one as well. They were very friendly and helpful when I called.
