Boy, this sounds like it could be a "polarizing" poll, like are you a Democrat or a Republican? :-) I am new to Head-Fi, and although I used to work at high-end audio dealers who sold Audio Research and Conrad-Johnson tube gear 30 years ago, I am getting my first introduction to entry-level tube audio ownership via a Maverick Audio D1-A1 combination with Sennheiser 650s. So far, I like the fabled "tube sound," but I am too new at this to offer anything other than a "noob's" perspective.
I enjoyed your "20 best headphones" article and review of the Apex High Fi Audio Pinnacle; now if I could afford that kind of tube amplification, I'd give you an unequivocal answer to your poll question.
P.S. Your music server is totally awesome.