I have the custom Einstein channel one module on order, and it is a bit delayed for the Smashing Pumpkins to get their mods, but thats OK.
I went for the Einstein mod for a few reasons. Mainly the Einstein doesn't have that massive low end so it should translate better to the MTS amps, and there are three mods to it, clean, crunch, and mega that are all going to be in one module. It should be pretty cool!!!