I agree with you. The Xray body is about the worst truggy body out there. The rest of the truck is beautiful and they chinced out on the body IMO.
I use the Mugen MBX6T body on my XT8'09. Its actually a perfect fit if you use the Mugen rear body mounts. I had to drill new holes in the rear shock tower to get the Mugen rear body mounts in the right position. Here are a few pictures.
One with it mounted. Not a great shot but its the only one I have.
Showing the Mugen rear body mounts on the XT8'09 tower. Sorry for the dirt. Picture was taken right after a rather wet race day and it hadnt been cleaned up yet.
This one shows the position of the screw holes I had to add to make the Mugen body mounts work properly.