With Forte IIIs you can use anything from low wattage to whatever...If I didn't already own have a Dennis Had "Inspire Firebottle" single ended amp I'd seriously consider the Coincident Dynamo (nearly did when considering the Had amp, but was charmed by Had himself in a video, and the Firebottle was cheaper as a barely used 12wpc model). With a Schiit Freya this makes a combo that's hard to beat by any integrated...for something in the push-pull tube world I'd look at the new "Black Ice" stuff from re-named Jolida MD, as having owned a 502p amp I can vouch for their quality, and they're still relative bargains compared to other stuff out there.
