Newegg has both of them for under $200, but the 530J is cheaper than the regular 530. Which one is better? 530 530J
EDIT: I see the 530J has the XD bit thingy. That's the built-in virus protection, right? Is that something I want or something that will only get in the way?
you will not notice execute disable, which contrary to AMDs propaganda department is not virus protection, but prevents a certain kind of buffer overflow. XD will not get in the way, but in certain cases will be a good thing for you.
if A J was the same price or cheaper, it would definitly be my first choice.
If you really wanted to OC, I'd look at the 540J which also has a feature akin to SpeedStep.