Another vote for Modwright. I tried the LS 100 and 36.5 and the latter was clearly better. I also tried an ARC Ref 3 about the same time and preferred the 36.5 at a good saving.
The two box version of the 36.5 is a clear step up to the one box version. Unfortunately, the dealer told me you can not upgrade from the one to the two box version. I would love to hear it against the ARC ref 5SE. It is about £2000 cheaper than the ARC, in the UK. I suspect it is better or at least as good. I have heard both, but not side by side. I run the 36.5 into the ARC Ref 75SE, but I have run tube Pre's into SS Power units in the past and very much like the combination.