I am thinking of picking up this computer today for $750. It has AppleCare through May of 2012, and the specs are as follows: iMac 24" 2.93GHz Core2Duo (Extreme?) ATI Radeon 4850 w/ 512MB vRAM 8GB RAM 640GB 7200RPM drive In great condition. Is this a buy? I don't currently have a real computer (other than my iPad and work laptop), and would like something to edit photos, store music, etc. Advice on this machine?