I was considering purchasing a 27 inch Imac (love the looks) along with a second Apple monitor for processing images but have read a few discussions pointing to the glare and difficulties with calibration. I am currently using an older Apple 30 inch cinema display that seems to work fairly well, but is probably getting close to the end of its useful life. I really need to upgrade my system. I would very much appreciate knowing if the Imac issues are real and what would be good alternatives. Thank you.