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NERDS
You can upgrade the processor to any other AMD processor which uses the AM3 chipset. Since I’m an Intel fan, I don’t use AMD’s so I don’t know what you could/would upgrade to.
EDIT: After a quick gander…
If you want to keep the CPU upgrade modest:
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103809
If you want the best AMD chip (from my quick search on NewEgg) that your board can support:
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103849