Hey Everyone, I am looking to purchase a USED Macbook Pro in the next few days. I have seen quite a few deals posted online. First off what type of processor should I be looking for, what OS should I stay away from if any, and how big of memory as a minimum to run Serato or any other similar program. The one i have seen so far is a 2010 Macbook Pro with 4GB Memory, 2.3 GHZ processor, and 500GB Hard Drive for $420. Another is not a Macbook Pro...just MACBOOK...with 2.0 GHZ processor, 4GB Memory and 250 GB Hard Drive for $450. Neither have stated OS included. Any advice?