low efficiency speaker vs. high efficiency speaker?

Some great responses above, and here's another point to consider. Many solid state desingers will not admit it, but quite a few designs sound better in their 1st 20% of power delivered, than in the next 80% left. In many ways this makes perfect electrical sense. One example: There are class A/B amplifiers that actually run in full class A up to a small point of the power amps rating, then "switch over" to full class A/B as they are required to deliver more power. If you had a speaker that was extremely efficient, you would then be having your amplifier run mostly in it's better sounding Class A state i.e., ending up with a better sounding system.

Thanks for thoghtful responses.
I want this thread open as long as possible to accumulate your information.
I have Totem Forest that is 87db sencitive.
I currently have Bryston 3b-st to drive them.
I've been offered to audition to Cary Cad 50M tube monoblocks which are 50W/ch. Along with that I've auditioned Quicksilver M60 monos in my current setup and they've literally outperformed my Bryston with clarity of midrange. Bass was a little-bit on the background with no significant difference in details. More clear on upper bandwidth and more musical. Dynamics havn't change at all!!!
I wonder if tube output power is more efficient than SS?
Or maybe this is just my imagination due to a transfer from SS to tubes? Another words is that true that tube amplifiers can drive with less power more efficient than SS?

I think Thomasheisig has the great set-up: efficient speakers AND fairly high-powered amps. This gives you a very effortless presentation and great microdynamics. What I would suggest is find the speakers whose characteristics you like then get amplification that will be more than enough.

As far as tubes vs. solid state, tubes tend to distort much more gradually and less harshly.