im buying a dell m170 xps laptop and am trying to figure out if it is worth it to upgrade from the 6800 ultra to the 7800 gtx. both have 256 of memory. the system is for gaming even though it is a laptop and some first person games such as fear will likely be played. i recognize that the 9300 series is very similar to the xps series but the person i am getting this for really wants the xps "factor". any thoughts?