I've tried to do my homework, but I've yet to find a definitive answer. Is it worth the extra cash to go up to the 2.13? I know it's a small amount, but that could be a new mouse, or a super drive. I've seen tests that indicate the rev b 1.86 is actually faster than the new 2.13. Confusing. This will be my only personal mac. I'm a graphic designer (adobe cs4) but I don't do much design work on my personal computer (I have a nice iMac at work). The usual facebook, email, web browsing, YouTube, hulu....nothing crazy. Thanks for the help guys.