Do this :
By an iMac 27". You'll fucking love it.
Install it right beside your PC, and then set up your mac with the same software you have on your PC (Photoshop, Dreamweaver etc) to make your Mac more and more usable for your business.
You still start using your Mac more and more, and your PC less and less. For any emergency jobs you have to do you can still use your PC of course (zero learning curve), but otherwise use your mac.
One day you'll forget to turn on your PC... and on that day, you will smile.
