I have had the pleasure of the HT3 in my house, and I tried them with a 30wpc receiver, 50wpc gainclone, and 300wpc monoblocks.
The gainclone caused some issues with an odd sound that seemed like the ribbons were "snapping". Turned off ASAP and never reinserted.
The 30wpc receiver (a JVC EX-A1 for the record) did very well, and was fun. Enough power.
The 300wpc monoblocks were fantastic.
I presently own a low powered tube amp (3-5wpc single ended pentode) and would NOT recommend that - but of course Al knows his speakers, and I am sure his insight would be beneficial.
I would take a poke at that Tripath integrated, for $399, and already in Canada, that could be excellent!