Hi guys, I'm sure this is asked a lot but I thought I'd give it a try. I own a Macbook which I bought sometime in November last year. It's works great but it takes a big performance hit when I'm running Parallels or several memory hungry applications at once. But now the time has come where I'm in a market for a new computer and I am looking into a series of iMacs available right now. What is the best iMac I could buy at the moment that won't slow down my computer if I wanted to run multiple instances of Parallels for example? Obviously money is always an issue but performance is really important to me. Thanks for your help!