It really depends on what it is that you use your pc for.....
Edit: Got this off the side bar and didn't look at the category...
One word of warning though, if you decide to upgrade the processor you have to be very careful selecting it.
This seems to be your board:
Here's what I found in the specifications section:
"Note: This board supports CPU up to 95W TDP only"
This means there are a great deal of processors to watch out for. I think a lot of the phenoms are 140w parts and if I remember correctly even the 6000+ are 125w(don't quote me on this).
Oh, and yes, you can only have am2/am2+ socketed cpu's, which as far as I know are only made by amd(again don't quote me)
Batch Variable how to