You can never go above the native resolution ;-) For a 27" display, the 2560x1440 (or whatever) is the native resolution. Running it at less than that will probably be a bit blurry as interpolation is necessary.
Dave- Did you make up your mind??? I'm currently running a 3 year old Macbook off a 20inch monitor and it is brutal! Planning to move up to the new 27 inch iMac and having the same debate. Is that i5 one you linked to the July 2010 update? Mind posting your thoughts when you get it? Thanks!
Dave- Did you make up your mind??? I'm currently running a 3 year old Macbook off a 20inch monitor and it is brutal! Planning to move up to the new 27 inch iMac and having the same debate. Is that i5 one you linked to the July 2010 update? Mind posting your thoughts when you get it? Thanks!