Welcome to the ever growing Apple family! I have a i7 920 that I virtually never use anymore, I do everything on either my iPad or my Mac Book Pro.
I am still undecided as what route I'll be taking in the next few months. I got a MB 13'' unibody and I love that little machine, I also love my Ipad. Most of my heavy/daily work is still done on my pc and I am in the process of deciding if I'll be replacing it with an high end Imac since that would be the closest thing to my actual specs machine. The only thing that worries me a little is gaming. I am not as much as an heavy gamer I used to but I still like to game. Unless things have change quite a bit many title were/are not ported on Mac and this could be an issue. It's true that I could use boot camp and use Windows but I am not sure if I want to do... Oh well I'll see. The only thing I am not too fond of is the Iphone, I had one and now I am using an Android phone which I like better.