Hi everyone, Looking at a used iMac for either my parents or myself. I am currently running a 2011 mid level mac mini with 16gb ram and the 2.5ghz core i5 processor. There is a used iMac a friend is willing to sell for $900, it's a 2009 27" iMac with the quad core i7 2.8ghz processor, 1tb hd, and 8gb ram. Is this a good/great deal? Is it fast even from 2009? (The quad core i7 makes it sound very fast and enticing) I may give my parents my mini and use the iMac for myself (is this a big performance increase, decrease, or the same??).. I don't really know because my mini is from 2011 and the iMac 2 years previous (09) so even though it's quad core it could be slower? Any insight? I could just get a new refurb mini + monitor for them .