I went from 0 Apple products to now owning 5 (that includes 3 iPhones for app development though) and my iMac is a great computer. For the price I paid yeah I could have gotten a bit more of a powerful PC but there are no regrets.
Once you spend a week or so on your Mac you'll pretty much know all you need to know to use the computer with ease.
I still have windows, running under VMWare and Bootcamp, so all the tools are still there for me to use.
Personally I think of computers as tools to get the job done, whether it be CAD work, document writing or yes even gaming. Some are easier to use or look more pleasing and some are more expensive... I like my Apple tools
