Low watt system for rock,electronica?

If that were my primary musical interests I would probably go the SS route instead. If they are secondary interests, as has been pointed out, they can sound pretty darn good on a low-power tube system done right. Those systems make acoustic music and vocals SO much more betta' sounding than SS (IMHO), and virtually all music more holographic, that I'd highly recommend the compromise in that direction. But, I'd have to say, as good as I've heard that kind of music sound on the low watt systems that I prefer to listen to (and own two very different ones currently), it always seems much more satisfying on a higher powered, well put-together SS system. I think it is a matter of deciding where your priorities are.

Marco

Although not my taste, the BIG Klipschorn.

I realize that was maybe a twisted question ,but I had to ask,My taste in music go from one extreme to the other,I loved the sound of the one SE low watt system Ive heard,Wavelength,Rethm ,Cary CD,and Alon sub.but did not get to listen for long,just wanted to hear the thoughts of more experenced audiophiles than myself,Thanks for your responses,also I like to listen at moderate volume, sometimes abit louder

I bet the system described above sounded pretty good!
Rethm is extremaly fast and dynamic.

I think in order to play convincing electronica/ pop/ rock, you need both a good dynamic and flow and preferably with enough headroom to be able to go loud without a strain.

Personally, I prefer SET or even pushpull amps playing electronica than most solid state based systems.

Ray, as Audiokin, above implies, the system you described and liked answers your own question -- doesn't it :)!
I.e.:
Single driver main speaker, no crossover if possible / subwoofer for say 200Hz, down. This driver (a Lowther in Rethm's case) has a very strong magnetic field and can/should be able to reproduce dynamics and details in an excellent way. Simplifying a bit, having a very strong magnet and low mms, the driver is usually very efficient; a front-loaded horn also increasing its efficiency even further. Efficiency + dynamics means, that speaker system driven by a lower watt, low distortion amp can produce realistic sound levels AND good/excellent sound and detail. An SET is low distortion within its optimum operating range (remember, we've left the low frequencies out of the set's range).

Indeed some such systems I've heard are more than good, they're spectacular!