There are several LTA Ref 40's for sale on USAM. Also the Carver Crimson amps mate very well.
If you can find one the Don Sachs Valhalla would certainly be my first pick. He's in Canada also so perhaps ask if he has parts to build another. You can't go wrong with any of those three and though they are different they are all winners. The DS has more tonal density than the LTA. The Carver is very good for the Price and runs very cool.