I've Macbook Pro and I'm playing waiting game for iMac as many other but more I wait more it feels I need to rethink my priorities and probably pick up this one Dell XPS One 27" - it has lot more power underneath for much less price and from display point of view I may not be making any compromise as it uses same IPS panel that iMac uses. At present I use 2010 13" MBP attached to Dell 23" iPS panel and it serves my purpose but I need more speed.
http://www.bestbuy.com/site/Dell+-+...rive/5773236.p?id=1218694834606&skuId=5773236
http://www.bestbuy.com/site/Dell+-+...rive/5773236.p?id=1218694834606&skuId=5773236