I have a 22" iMac which came with it's own wireless keyboard and magic trackpad. At first $2,000 seemed like a lot to pay, but it's totally worth it for the speed, long life, and reliability. The only problem is, I'm a hardcore gamer and Macs absolutely SUCK for gaming due to a lot of files being encrypted beyond Macs capabilities. I can't even get a Nintendo 64 emulator for Mac, how pathetic.
Unless you want to buy an accesory for Mac that let's you run programs compatible with Windows, it's definetly not a gaming computer.