Hey Tom That's right... to use any of the accelerator UAD cards you will need a Express card slot. Your MBP should have one. However, the iMac currently doesn't have one... so your next option would be the the Mac Pro. The Mac Pro does not come with a screen included. Apple's 24 & 27" Monitors are very nice but you can easily pick up very good Dell monitors too for less... No problem at all with the questions! It's always exciting to be buying a new Mac! btw, there is a rumor sites buying guide which is pretty useful. The current Mac Pro is due to be updates sometime... It doesn't mean you should wait until it is, as noone knows when the new version will be released. It may be soon or in a few months. But I thought you may like to know: [url]http://buyersguide.macrumors.com/#Mac_Pro[/url] Thanks Rounik