@thatBeatsguy: sorry, I don't think I was very clear there. I have the T5p and absolutely LOVE them, but Tyll had made some pretty negative comments about them on a different forum (not on the IF website). Of course, that guy has forgotten vastly more about headphones than I will ever possibly know, so I said that with tongue firmly in cheek.
As for the COP, give them a shot!! I happen to be a big fan of the Beyer sound and while I haven't heard those specifically, there are definitely some people around who really like them. Tyll made a passing comment about them (
here) during his review of the AKG 267 Tiesto headphone, saying "After hearing the Beyerdynamic Custom One Pros adjustable bass feature, I expected the AKG K267 Tiesto adjustable bass feature to be just another horrible sounding gimmick." This obviously leads to the conclusion that he was not a fan of the bass feature, but again, this doesn't mean someone else wouldn't like it. The only way to know would be to try them yourself, and if you don't have anywhere around to go and demo them, maybe you could pick up a pair used from the forums here or on eBay or something and minimize your loss if you do decide you'd like something else.
Personally, I'd give a 770 a go with EQ over the COP, particularly for monitoring. But that's not based on actually hearing the COP, just reviews and whatnots