I try to stay away from all of the variants on the same saber as well. I guess I did get he CIII Kenobi and Sidious Best buy exclusive, but those don't count.

The CIII was just cool, and the Sidious was the first .45 I purchased. I didn't know anything about MR, but saw the saber at Best Buy, and thought, "Why not? I'm sure this will be the only one I buy." Famous last words!

I don't think the .45 Sidious or Yoda have shipped yet, but I know the initial wave of Obi-Wan and Anakin sabers have already been sent out. I received mine a few weeks ago (the Anakin saber is particularly impressive!).
As far as Grievous, the word is that as of right now, since he wields generic sabers, they may not do anything at MR for him. However, money talks, and there is certainly a market for him, so I'm guessing something will come out eventually.
