For stone molds I would definitely go with Slater molds (not sure if those are the Ebay ones or not), I would just get an 18" mold if you are a LW or a 20" mold if you are a HW. The 18" will make stones ranging from 200-300 lbs, and a 20" will make stones ranging from about 290 lbs to 400+ lbs.
Where in Virginia do you live? There are a number of places that have strongman equipment and there should be one within driving distance that has a log. If you definitely want to purchase your own then a log from Pitbull would be my recommendation.