I use my iMac 24 incher (early 2008). I got it refurbished from Apple later that year. Since getting it I did have to replace the power supply last year. I also upgraded the RAM to 4GB. I found it slowwww recently so I decided to swap out the hard drive for a 240GB SSD...MAN DID THAT MAKE A DIFFERENCE! Breathed new life into it!!! Zippy again. I tried to use my MacBook Air 13 incher (2011) but find the screen just isn't good enough. The colours aren't true and blacks washed out! What do you use?