I have a 27 inch late 2009 i7 2.8 ghz w/ 12 gig of Ram and a 2 Tb hard drive running Mavericks. GPU is only 512k but it does the job. I started to have some issues with faint vertical lines on part of the screen that are visible only on certain colored backgrounds but can be annoying when doing photo editing (which I do as a hobby). I took the.computer to an Apple store and they are replacing video cables first as that is the cheapest option. If that doesn't work, they would next consider replacing the screen, which would cost about $550. The computer is otherwise great. It seems like a lot to put into a 5 year old computer, but where can you find a computer with those specs for the money? I figure if I gave the computer to my wife (she does very basic things like email and internet), that would probably be more than she needs for several years -- she is currently happy with an 8 year old Dell AMD Dual Core. Would you spend the money if it comes to that?