i5 quad core is at $1529 i7 quad core is at $1699 I definitely have decided to get a refurb 27inch iMac. but can't seem to decide between the two. Any suggestions? I mostly do programming and very minimal graphical works(mostly for drawing figures for research papers) and obviously.. emails, web and minimal photo/video editing(personal). If i do get i5, would it last about 4 years without causing frustration over speed and performance? Thanks!