I think it would be a waste upgrading. The prossesor is going to be limiting now days. I would spend the money on a new pc , probably go for something with an i5, the onboard graphics will be better than your current dedicated graphics card
I have this tool chesthttp://www.halfords.com/webapp/wcs/stores/servlet/ProductMobileDisplay?catalogId=10151&storeId=10001&productId=745201&categoryId=255214&langId=-1
I can’t fault it! Also worth trying to get a halfords trade card you get some decent discount and there tools have a lifetime warrenty. And I get t handle Allen keys!