cooch,
I have owned a very reasonably priced SET amp (DARED 2A3C off ebay) for about 3 weeks now, which is matched with a pair of XRS'. Initially, I considered building a Dynaco-35 kit to match with the XRS'...and I considered some inexpensive el34 push-pulls. Sounds like you are in the same boat I was in (PP or SET).
Anyway, my very reasonable SET/XRS combo is enthralling. I was never expecting the combo to sound this good. All the SET-hype that I had read about is absolutely true. The XRS' produce a midrange like I have never heard. And the bass far exceeds my expectations...I never thought that such little drivers matched with an 8W SET could produce bass that I could feel. It does.
I can't speak to the PP amps, because I haven't heard one with my speakers. But I am not left wondering. I am delighted with the SET/single driver combo. Not worried about the grass being greener elsewhere. I'll probably be firmly planted in the SET ranks for the rest of my life.