Dean,
Just a foot note about the tiller/plow discussion of a day ago--relative to sod. I bought a tiller a year ago thinking it would replace my plow. (I have a 147 and a 42" tiller).
This past spring I tilled the part of my garden that had been plowed in the fall. The tiller performed fine. When I attempted to expand the garden (going through sod), the tiller did the job, BUT, I gotta say, I thought the severe side to side shaking of the tractor was gonna cause something to give. Wow. Made me think of removing a set of tines on the tiller to reduce the load.
So, I plan to continue to use the plow in the fall and the tiller in the spring.
BTW, what wasn't mentioned in the discussion is the type of soil your cutting up. In NW Indiana we have CLAY. It's like concrete and both tiller and plow work best a few days after a saturating rain.
If your soil is sandy, the tiller may be OK for busting up the sod but I think the plow before the tiller is the way to go. As someone said, twice the seat time.
You might also try running an 8" single bottom instead of a 10". I was given an old 8" and hope to see what it does this fall.