What is your experience with amp power?

@curiousjim mentioned Acoustat. For years I used a pair of Hafler DH-220s running in bridged mode to power them and the RH Labs sub I have. This provided about 440wpc. Then a few years ago someone pointed out to me that electrostatics aren't exactly stable impedance and that the bridged mode was not an optimal set up. It was a simple enough experiment to change things by flipping the bridging switch and moving the speaker cables to a single channel on each amp. 

The difference in sound was astounding even though I was only providing 100wpc to the speakers! The detail and depth was greatly improved and the bass was still authoritative. I was amazed. (And my butt was sore from kicking myself for wasting all those years! 🙄)

The point I'm attempting to illustrate is that power is only one factor to consider. Compatibility and quality should also be carefully considered in your choice of amplification. BTW, I wound up with an ARC VS-110 which is about 110wpc and I'm happy as a clam. While it doesn't go to the subterranean depths of the solid state Haflers, it does everything else very, very well. 

Hope these thoughts help your hunt.

Happy listening...

Here's a real-life experience that, IMO, about sums this up:

I and a friend spent some serious seat-time with a pair of Aerial Acoustics 6T speakers (90 dB for 2.83 volts at 1 meter on axis; 4 ohms, 3 ohms minimum, low reactance; power requirement 25 watts minimum, >50 recommended) in a scheduled and well-orchestrated audition (same sound room; same acoustics; same day; minute or two between A & B listening sessions; same music; etc.). BTW: If you've got the dough and the right power source for these Aerial 6T, they are hard to beat, if that's even possible in their price range. The power source used for the first listening session was a MAC MC275 rated, conservatively, at 75 WATTS into 2 channels. Forget what the pre-amp used was but it, too, was a MAC. Minutes later, the MAC MC275 was swapped out for a MAC MA5200 rated, conservatively, at 100 WATTS into 2 channels. Within seconds (i.e.  you didn't have to listen long or hard), it was quite obvious the MC275 was able to make those Aerial sing! Did they sound better or even as good with the MAC MA5200? NO WAY! They still sounded very nice. However, the beefier power supply of the MAC MC275 and the current it could provide was immediately palpable. It's not he WATTS. It's the power supply.

It seems the closest thing to a perfect world of amp employment is

via Bi-Amping

Mono-blocks>bi-amp

Even though the majority of one’s listening is done at around the 5 watt mark, I’m a firm believer of having ample power for transients. I also believe the quality of those watts make a huge difference  as well. Having that head room and power even with highly efficient speakers make for a much better listening experience.  No straining, no clipping, ease of presentation. In my experience my Tannoys are 95 db efficient and I drive them with a 500wpc McIntosh amp. When I first got the amp I thought it would literally blow me out of the room, but that wasn’t my experience. I think I’d be hard pressed to go down in wattage. 

High, clean current is most important. Too often watts are way over stated by a manufacturer and then when hooked up they sound weak. As always, the only way to really know is to place an amp in your system and see how it sounds to your ears.