Tube Research GT-100, GT-200, Lamm 1.2 for 4 ohm

Guys, I am looking into upgrading my amps, my speakers are Reimer Tetons, with a load from 3.8-4 ohm. I am looking for as close as I can get, to high power SET sound, with the midrange magic, but extended treble, and monster bass. I understand my pre-amp will be important too, but, I am concentrating on amplification for now. I am not dead set on these amps, per se, and would love to hear some suggestions, and feed back from owners who have these amps.

Thanks in advance

Steve