The C++ (yes two pluses) with 105 power transformer is the absolute cream of the crop. The export transformer version is also preferred by some for a richer, creamier sound. Even the most common ones (common being a relative word here) with the 100 power transformer are no slouches.
The C++ w/105 transformer is the only amp I've ever played that could give a Larry Dino a run for its money in terms of explosive note attack, over the top saturated yet well defined crunch and overall viciousness.