I'm running a 24" iMac, just purchased a few weeks ago, 2.8Ghz, 2600 HD PRO, 4 gigs ram, standard keyboard, and a Logitech mouse - runs 3 flawlessly. I was running 2 on a dual 2.0Ghz G5, but the video card (Radeon 9800 Pro) died, and I just could'nt see dropping $300 on a 4 year old video card, so I upgraded. I ran a 3rd copy from a Mac Mini, using Synergy. Never see any lag now, and the temp stays very low - the G5 pumped out massive amounts of heat dual boxing. It was getting pretty loud, too, the fans just got noisy. It is 4 years old, so it's resting now in it's box in the closet, when I get a chance I'm going to clean it, put the stock video card back in, a new drive, and donate it to a needy friend or family member. It's still a good machine!

I set up two trial accounts along with my 3 on the iMac, and it runs 5 no problem, but it's pretty cramped on the screen, so I'm going to try and see how well it does with my old acrylic 23" Cinema as a second monitor. It means adding more cables and stuff to my desk, but it would be cool to have it for Photoshop too.

The Mini is now doing what it was bought for: serving up iTunes and multiple hard drives for AppleTV, watching Hulu, and ripping video in Visual Hub. My place is now much quieter and less cluttered now, I love it. I'm putting together my choices for furniture (moved recently), and the Mini will probably live next to the Apple TV, and I'll access it via Apple Desktop Remote from the iMac.

ClonedKeys is all I need, I've only had lag once or twice, so I don't see any reason to change at the moment. I was going to play with a Bootcamp install and Keyclone, but that's for later. I havent used Windows in about a year, so I need to get up-to-date on virus/keylogger protection, there's no way I'm putting my accounts at risk until my Windows partition is locked down.