hey photographers, I'm looking to get a large display to hook my MBP up to. My main requirement is for it to be good working with digital photographs. I've always neglected the ACD's as too expensive, but now that I'm shopping seriously, am starting to consider them used. There's a local guy that has two of them, and the lowest he'll go is $550. I haven't seen many of them advertised around here (DC), so it's hard to say how much they should go for. Does this seem pretty fair, or are there other IPS monitors I should be looking into these days? thanks for any advice!