Thf - 120 watts of Pure CLASS A Lamm power is deceiving.. I just took them over to a friends system powered by 400watt Parasound JC1 and max output was no different.
If you were really concerned get the 2.2's (I owned the 2.1's before I went to these special edition 1.1's as I found that even though I had was using 800watts into 8ohm EAD powermaster 2000 running only two channels, the Lamm had way more vice like control plus more warmth. I like the CJ warmth but wanted something more refined myself. Vocal and horns are amazing on the Lamm's, especially for me to put up with the Class A heat output these generate in Phoenix, AZ!
I've heard the 302 and it is liquid smooth like tubes but with a different warmth. I had to try the Rowland 501's to even get close to the output and control of the Lamm 1.1's I have (The Rowland 201's couldn't control the 3.4ohm woofer on my WP7's like the Lamm could). The 302 powersupply is much more capabable, and really in a different league
The Sonas Extrema's only look like 88dB effecient so unless your room is really huge the Lamm's will drive it without a problem and with ease!
http://www.stereophile.com/loudspeakerreviews/915/index4.html