I currently have an older iMac with tech specs of: 2Ghz Intel Core 2 Duo with 3 GB of RAM (maxed). What is the performance difference between that and a new Air running specs of: 1.8GHz dual-core Intel Core i5 with 4GB of RAM (though I could upgrade to an 8)? Would I see an exponential difference? I guess I get confused with the 2Ghz vs. 1.8Ghz. I know the Air would have a newer processor, but is it that much faster? I'm looking to upgrade and would love to just have an Air hooked up to a monitor instead of buying a new iMac and laptop. The programs I generally use are Adobe's CS and Corona SDK. Thanks for your help!