Well, two fellow AC guys, Vik and Rob, were kind enough to bring some stuff over this afternoon to listen to. Vik brought his wonderful new Audio Note DAC (my new Benchmark is nice, but that Audio Note is awfully darned smooth--man if I only had the $$). Rob brought over a couple pairs of DIY SET monos (his own and a pair of Bottlehead Paramours), and a Bottlehead Foreplay (sorry Rob, I can't remember enough about what mods you've done on the amps and preamp to comment on that).
All I can say is that I was bowled over at how good the system sounded, especially with Vik's DAC, Rob's amps, another pal's old Mac Preamp and my DCs all hooked up together. It truly was the best sound I've ever heard in my room (and I'm still amazed at how loudly 3.5 watts will play).
I also really liked the sound of my Benchmark directly into the Paramours. As such, I'm now inspired to sell my Mac 2100 amp and go SET. I really can't imagine parting with the De Capos at this point.
All in all, a great day of sharing music and ideas about how to get good sound on the cheap.