Smallest Bookshelf Speaker Worth Listening To


Does anyone have any opinions on the smallest bookshelf speaker worth listening to> I found the Kans to be quite good in a bookshelf system, but wonder if there are others that are even smaller in size. I remember some years back being taken by the small size of the Acarian Alon Petites and they sounded great in a full blown setup. So what is out there today?
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There's another $3500 Danish wonder bookshelf that has impressed me more than the Sonus Faber Electa Amators, ProAc 1SC's, Dynaudio 1.3SE's or B&W N805's ever did in my system...they're the System Audio SA2K speakers. See them at http://www.system-audio.com/showpage.asp?siteid=2&id=312

Power handling: 200 Watt
Impedance: 4 Ohm (easy load)
Frequency response (+/- 1.5 dB): 40-30.000 Hz
Sensitivity (1W, 1m): 87 dB
Crossover frequency: 3000 Hz (24 dB/oct. Linkwitz/Riley)
Dimensions (WxHxD) cm: 19.5x34.5x30 (in: 7.7x13.7x12)
Woofer: System Audio W2K (custom Scan Speak)
Tweeter: System Audio TK (custom Scan Speak)
Finish: Maple (real wood). Other finishes available on order

I've had them since the January CES where they sounded incredible with the new BAT integrated. I brought them home and am using a Sonic Frontiers Power 2 and Kora Eclipse preamp with them and don't need a subwoofer to feel the Chinese drums on the final track of the Burmester III CD nor a piano in my living room to bring Melissa Walker to life in my living room on the first track.
Spendor S3/5 $900/pr. and ATC SCM 7 $1100/pr. The ATCs are very dynamic and open.
Spendor S3/5 - Audio Physic Anniversary Step - Aerial Acoustics Model 5.

All VERY small, relatively affordable (especially used) and incredibly musical.