I have a 21.5 W/SSD and 1TB HD. I have tried several external monitors. A ACD, HP, and a EIZO currently. http://www.eizo.com/global/products/coloredge/cg303w/index.html I have to reset the pram each time to wake it from sleep. No such problems with my 2010 model. I went to the Apple store with the EIZO and the 21.5 and had them test it there. They tried the monitor on four different 2011 imacs. Would not wake it from sleep. If you put it to sleep manually, it will wake up. If it goes to sleep on it's own, forget it. This is a widespread issue according to Apple tech support. I talk to Apple engineers and they are aware of the issue. I have several models at my Office I could swap with in the mean time but my work imac from home still needs replaced. They offered a Refurb i7 2.93 with SSD only for 1799. Should I take it? I cannot wait until another week for my 2011 27 imac I have coming with SSD and 1TB HD because the problem could be there also. I would have to add a external HD for movies and photos via firewire, but that will add to the cost. The 2011 21.5 with the i7 2.8 and SSD and 1TB HD costs 2200. If I am not mistaken the SSD in the 2010 model is the same as in my 2011 model. My i7 is quicker by a little bit and I would be giving up HD facetime and two thunderbolt ports. Will be getting a better GPU and bigger screen in the process. The reason I ordered the 21.5 is because I have already a better screen than what is in the imac 27 with the EIZO and I didn't want to wait four to six weeks. Anyone with the same problem?