I found a phenom II x2 560 Castillo processor so im guessing it uses the same motherboard socket as the one you posted, you have to look for a motherboard with an AM3 socket, however I would wait for someone to confirm, just in case im wrong.
edit: I looked at amd's website and the 555 isn't a black edition its just a phenom II x2, anyhow the phenom II x2 both black and non black edition are socket AM3. Maybe someone else can suggest a good mobo and gpu, im not too sure which mobo etc. Would be good for what you need to do. Sorry