I bought the 463 with the Brabus conversion and it only had about 80,000 miles on it, which is nothing for that motor. I think it was an assembly issue, given the bolts.
Right now, I am leaning towards a stock 3.2L and going through the entire drivetrain. It will cost nearly the same, but the entire truck will be fresh.
I thought long and hard about the diesel swap, and have mostly decided to stick with the gas (and stock) configuration. I am working with a solid shop here in Prescott, and we are discussing the OM606 route a bit more.