han_n,
I have heard the Tekton Double Impact (not the SE version) at a recent audio show. I really liked what I heard; certainly a great bargain at its price. I bet the SE version sounds even better. I don't recall what amplifier was being used. At 99 db/w, these speakers can be used with very low wattage amps, particularly if the speakers are played at reasonable levels. To me, it is more of a bragging rights kind of thing that a speaker can play at 115 db--I would not want to listen at that kind of level (like owning a road car that can go 220 mph).
While I have stated a preference for tube gear, particularly where one can get by with modest amounts of power, I certainly expect that good solid state gear can be quite satisfying. I have not had that much exposure to Pass amplifiers, but, the First Watt amps I mentioned that I really liked are designed by Nelson Pass. The First Watt gear is aimed at a particular niche market--high efficiency speakers that present an easy load to drive. I like your choice of the lower powered model from Pass' lineup. I once auditioned a 50 watt solid state amp and a much higher-powered model from the same manufacturer (both very similar in design) and preferred the lower power model; it might be use of fewer transistors operating in parallel that made the difference (I hear the same thing with using multiple tubes to achieve higher power output, the result is not good).
Most of the better brands of solid state gear deliver decent performance. There is a sameness to the sound of solid state, including Class D, that makes it actually hard to make a terrible choice. That is not the case with tube gear. There is much more variety in sound with tube gear and that is both good and bad--good if you carefully choose what works with your system and taste (or get lucky), more likely bad if you don't carefully audition and choose wisely. A lot of even "bad" (to me anyway) tube gear will still deliver the rich sound and enveloping soundstage that is the most obvious characteristics of tube gear, and one can easily, at first, miss problems in other areas of performance. It takes more experience finding the right tube gear choice.
I should also mention that, I also like the Ayre brand of solid state electronics. For Class D stuff, I have heard decent sound from Bel Canto amplifiers.