Hello,
From reading the back and forth exchanges, it seems to me you've already made up your mind while still asking for recommendations. which you proceded to shoot down one by one.
So at the risk of repeating others and still not being heard, here are my experience and recommendations for the HD800/amp pairing:
1. If you insist on SS amp your best option is to forget about the HD800 and get a pair of more forgiving headphones like the Audeze LCD-2 or the Beyerdynamic T1
2. If you want to stick with the HD800, my strong recommendation is to stay away from solid-state amps. Even the best SS amps still have some harshness--some call it white noise--that the HD800 will reproduce with excrucuating fidelity. I never could listen to the HD800 on any SS amps for very long, the Burson Audio included--by the way, this amp sounds wonderful with the LCD2/3 and the Grado PS1000. On poor rock recordings, the HD800 sounds positively unpleasant with SS amps. I think the HD800 is too revealing for its own good so it reproduces everything faithfully, warts and all.
3. The HD800-Red Wine Audio Corvina (balanced tube) combination is purely magical. The balanced output tightens the bass and sharply focuses the midrange. The treble has lost all its harshness while remaining very detailed. The RWA Corvina is a very good buy at $1500--same amp as the big sister Isabellina--but it doesn't have a DAC. The balanced Woo WA22 is also a good match with a gorgeous look and a lot more money ($2500).
4. Because of fastly advancing technology, you'll change yourPC and your DAC more often than you'll change the tubes on you Head Phone Amp. HPA have tiny amplification (typically less than 5 watts) compared to speaker amps (50-500 watts). So the tubes are not driven very hard. I've had a HPA tube amp for 5 years with still the same tubes and the same wonderful sound. In the same period, I have gone through three DACs. Besides, switching tubes is fun--I am oldfashion, I swapped tubes, I don't roll them. It's the simplest and least expensive way of changing the sound of your system.
But if you still prefer the convenience of SS HPA--I think your mind is already made up--your best option is to chuck the HD-800 and get an LCD2, or a Beyerdynamic T1 and save a little money in the process. By the way, the HD800 is also allergic to silver. I still love its near-holographic sound when mated with a balanced tube amp and UP-OCC (Ohno copper) cable. Magic!