I'm looking for a solid 30-inch monitor to connect to a late 2012 iMac. Primary need is for photo editing, though I will also use it for basic stuff, such as ms office, movies, music. Price range under $1500. I've looked at the Dell U3011 reviews, which seem promising. Just wondering what the general trade-offs will be when comparing these monitors features against the Apple Thunderbolt Display. Guessing will need to buy a web cam, no speaker/sound included, any other Mac program functionality issues? Is the Mac monitor that much worse for photo work?