My personal preference for you is to purchase a OS X 10.6 Snow Leopard install disc, then update to OS X 10.6.8 and STAY THERE! I have other computers at home that deal with 'work' (batch editing photos, photoshop, etc). I will be using it only for web browsing, listening to music and watching movies. My main priorities is speed and performance, the second priority is to be able to use the magic trackpad. So now my question is, What OS should I run for the iMac (Mid 2007, 2.4Ghz, 6GB Ram, 1TB 7200rpm HDD, ATI Radeon 256mb GDDR3 Memory). I also picked up a used magic trackpad for it but only to realize after that it requires 10.6 to run the magic trackpad. I installed a 1tb disk in it and 6gb of ram to bring it up to modern standards. My friends were going to dump it as they are going to get a new imac 5K so i decided to take it home. I was going to attempt to install a new inverter and battery in it but instead, i was able to find a 24' mid 2007 imac with a failed hard drive. I have recently lost my early 2006 macbook.😢 It has had numerous issues such as the common flickering screen, and the bulging battery issue.