I've had my 21.5" for 2 1/2 weeks and now I want to upgrade. It's the higher-end one with the ATI 4650 HD card and the 1TB drive. Do I have a shot? I just passed the 14-day return window. I definitely want to upgrade to either the new 21.5" higher-end one or, for an extra $200, go with the lower-end 27"... By the way, FYI, I have 16GB of DDR3-1066 RAM. Some of you may have added RAM as well so I checked that out as well: ALL four models with ALL of its base and upgradable processors support BOTH 1066MHz and 1333MHz DDR3 RAM. How much of a difference between the two speeds will be noticeable? I could just sell all four of my 4GB DDR3-1066 chips (all NEW! Grrr...) and then buy DDR3-1333's...What a pain... Any recommendations?