Try to stay with ones whose impedance does not go too low and who can be driven by your amp. You can check this by looking at their rated efficiency. Each 3db increase in output requires doubling the power. But the choice is very wide and will depend on personal preference. Spendors work well with tubes as do many others.
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You've got the right idea- take a look at
for more information.
Good choices include (but are not limited to) Audiokinesis, Merlin, Coincident Technology, Ref3A, High Emotion Audio, Ridge Street Audio, Vandersteen, Wilson...
If in doubt look at what the designer is using. If he is into tubes, you will do well. If the designer uses transistors, I'd look elsewhere.
Atmosphere listed some very good choices, and there are even more available if you are into DIY.
I have owned Rogue preamp and amps. I have always found them to be a clean, clear, non-tubey sounding equipment. Based on this I think I understand what you are looking for.
Changing speaker posts, by-passing is even better, will possibly allow more details to come through but won't do anything for speaker colorations.
I'm not sure I would agree that there are speaker made for SET. There are certainly very efficient speakers, but that just helps SET work with them. The coloration that you have heard with such speakers could very well be coming from the SET. Like speakers, some SET are less colored than others.
Also, there is nothing wrong with running very efficient speakers on 150 watts/ch. I have added a second 50 watt PP amp to my horns and the improvement in bass control, as well as enhanced separation, is amazing.