Hi, I've been using Snow Leopard for many years with has been working very well for everything I want until... today. I have a Core 2 Duo 2.66Ghz iMac with 4Gb RAM and Radeon 2600 PRO video. Mainly, are two things that made me start to think about and upgrade: 1 - I use AirPlay a lot, but in Snow it works only with iTunes. But I wanna use all Apple Audio Plugins (AU Units - 31 band equalizer, parametric eq, low and highpass filters etc) which I really don't know why is not available with iTunes just only with a few 3rd party programs. But, all that 3rd party programs doesn't work with Airplay. I knew that in 10.8 any audio can be transferred with AirPlay which is nice for me. 2- I'm planning to by SimCity which needs 10.7.5 ou + to work. The thing is, Snow is a great system that ever worked very well to me. I've installed it since it's release date and it never ever crashed and it made my system work faster that 10.5. I don't know which OS choose for an upgrade. Since I don't have a newer Mac, speed is a real thing here. Does worth the upgrade for 10.8? Should I wait for 10.9? What do you guys recommend for me?