I love ZVEX. I have a Distrotron and a SHO clone.
I've always wanted to try the Nano amp but as you guys mentioned its very pricey.
...but there is a big diff between a low wattage amp plugged into a 4X12 cab, moving your drivers 3mm forward and back wards, compared to a high power amp slamming those speakers 2cm forwards and back wards.
Ive always wanted to try the Eminence Reignmaker or Maverick. They have an attenuater built into the speaker itself to cut volume by changing the space between the magnet and the voice coil via a dial on the back of the magnet..