Been there, and spent a lot of time thinking about it. I made the same decision Tony did. Start with 35's (also MTR K) and look at 37's next time around. I didn't want to trim the rear pinch seam, which left me needing rear upper and lower control arms to move the axle back. Plus sleeving the front axle, etc. I also wanted to delay a re-gear...
But 37s would be nice! :-)
Jared