Oh man, tough question. I think I'd have to go with the X-Ray and just deal with the center diff issue. I've driven quite a few rc cars and have seen many, including 8ights, Mugens, etc., and none seem to float over the rough stuff like an X-Ray does.

Can anyone confirm whether the screw pattern on the Kyosho spur matches the hole pattern on the X-Ray? If they do match and it's just a fitment issue, it might be pretty easy to over come with slight modification to the spurs. I have to modify the spurs to make them fit all of 1/8 scales.