I have a late 2009 i7. Had a couple issues recently. First repair bill was around $300 (new hd, heat sink and a few other small fixes). The next one, if I have the work done (some screen/backlight issues) is about $800. Is it worth fixing, or should i just look at getting a new machine? If I decide to go with a new machine, which 27in one would you recommend? 2.9GHz, 3.2GHz or 3.4GHz? Is the i7 processor worth the extra $$? Any necessary upgrades (ram)? I'm a graphic designer specializing in print; so Illustrator, Photoshop and InDesign is used heavily.