Don't worry about prefit barrels as long as it's from a reputable source. If you're doing standard calibers like 6.5 creed, Mile High and EuroOptic have the real specs and the real Cerakote colors to get you a "factory" barrel. Any other shop can turn a good AI barrel, I use Long Rifles Inc, personally.
As for color, where are you located geographically and will you hunt with it? I've never liked Pale Brown, I don't really care for the color but it makes no sense to me in the grass/woodlands of WI where I live. If you live in the desert it would make more sense. Dark Earth and Sage Green will blend in with more environments IMO, but I can't imagine why anyone would choose anything other than Sage Green. It's scientifically proven to be the best