Tboooe, I like the Frey and above line in Nordost.
As to a tube amp, I would say that depends on budget, BUT I think something like the ARC Ref 75 would be a good match, or better still the Ref 150. I am partial to the ARC D70Mk2 with my GH's...that's a match made in heaven, BUT the ARC D70Mk2 is a little more difficult to make work ( biasing, etc).
One could also try the VAC line as Jmcgrogan2 said above. Other alternatives would be the newer Jadis gear ( again depending on budget)- or IF looking for less costly--the Prima Luna stuff.
Unless you like to listen VERY loudly, I think 60 watts/ch of tube power would be more than enough.