I went through the same questions researching speakers to go with my first Clari-T waaayyyy back, about 2 years ago. I built some Fostex 206E BR boxes and fell in love with their immediacy and spectacular vocal reproduction. But, they were light in the bass and edgy in the presence region with some music. Having seen my personal light, I put my Gallos up for sale and started looking for something that could keep the strengths and smooth out the weaknesses.
I heard the Decware RL-3's and was unimpressed. Then I took a flier on the Zu Druids. At 101 db efficient, portray accurate bass to 40 hz, have an extended upper end, and present a very tube-friendly impedance curve.
The claims about them are strong and seem to make them an outstanding match. In practice, the 6 watts was more than enough to play heavy metal loudly and sound good doing it! This is not common to hi-eff speakers. Headroom also means classical music was beautifully portrayed and composed, from the quietest to loudest passages. I think this dynamic-scaling ability will stand out with whatever you wind up with.
Oh yes, the vocals. The Druids will not have the supernatural speed and incision of Lowthers or even some of the Fostexes. They are tone monsters and you WILL notice the lack of crossovers with vocals. Dynamic explosiveness, tone, and quick feet equal captivating voices.
I sold the Druids for Definition 1.5's, then Def. Pro's.
Zu has a 60 - 90 day in-home trial too.
I seriously doubt you could go wrong with Louis' stuff, though I haven't heard it.
Whatever choice you make, I wouldn't assume this is the last stop. You will hear things in your music you haven't heard before. I don't mean the coughing engineer at 3:37 of whatever CD, rather a new cohesion, a joining of parts. That doesn't mean you'll necessarily love it or prioritize these new elements but I'll be shocked if you don't at least say "I see what they're talking about".
For that reason, go all the way in that direction. Don't get a 92 db two-way with first-order XO that will be "just enough". Get something like an Omega that wires the driver straight to the amp, which is the next best thing to being wired into your brain. If you're going to a whole new paradigm, jump into the deep end.