I'm looking for some advice. I have an early 2008 MacPro, 2x 2.8 GHz quad core Xeon with 6 GB memory. A year or so back I upgraded the graphics card to a GT 120. I don't use the Mac Pro for any really heavy lifting like video editing. I'm thinking I could add more memory and perhaps an SSD OR I could save and buy an iMac in a year or so. Is my machine worth upgrading?