You say you miss the BA, but I also recall you saying the 800 ran askew of your preferred FR. Is it just the amp that you miss or a synergy with something specific?
I'm mesmerized by the Lamp > BA > HD800 combo, and find this to be the only setup that gives my estats a run for their money. That said I prefer my Dynahi with the bulk of my other headphones. Sadly the BA + Dynahi did much of nothing when I tried them with the LCD2/3. Those cans just hit their peak quickly and don't advance commensurate with equipment upgrades ime.
Did you own the Cooter amp? I tried to get him to build me a little something, but nothing doing. I've been building furniture as a hobby these last couple of years and boy would his amps look great on a custom walnut audio rack.