Forget about SET if worried 30-40 WPC not being enough. Heat will be of some concern, usually more heat with more power. I'd stick to push pull amps, fairly low power. Still like your PL inclinations as you can switch out a variety of power tubes with minimal fuss.
I owned my PL Dialogue Four (self modded with latest PL models Takman resistors and a few other extra mods) at same time as many multiples of price SET amps, I didn't feel deprived with PL. Don't let naysayers of PL throw you off. Not saying there's not other good choices, I've also owned Cary and Conrad Johnson push pulls, its just in same price range your comparing apples to apples.