I have just purchased A 2008 Mac Pro with a ATI x2600XT inside. I am aware that this card is somewhat of a upgrade from the X1900XT that ships with the standard 08 Mac Pro configuration however it is not good enough for what i'm going to be doing. I would like a reasonably priced card which will work with my Mac Pro. I am looking for a sub £100 card. What are my options?