I don't know if you mean that post I had from last year. I'd keep most of my recommendations, but with a couple of updates:
< $500 - Bottlehead Crack + Speedball
< $1,000 - Cavalli Liquid Carbon (Also worth looking at: Schiit Mjolnir 2 and some good tubes)
< $2,000 - Questyle CMA800R (Also worth looking at: Linear Tube Audio microZOTL2.0)
<$3,000 - DNA Stratus
<$4,000 - Cavalli Liquid Gold
I need to spend some time with the HD800 and the ZOTL2 and Mjolnir 2 to really see where they fit. They are solid devices and quite popular choices with the HD800. They are worth considering, I just can't fully recommend them without hearing more.
Others to consider:
Apex Teton $5,000 - I have heard from several very reputable people that this is the best of the best. Haven't heard it personally.
Wells Audio Enigma $3,500 - I haven't heard this combo specifically either, but this amp is absolutely fantastic A+++. Need to hear with HD800 ASAP!
Audio-GD Master 9 $1,550 - Decently good treble control & dynamics. Strong on technique, but lacks a little soul. Great at low volumes like 75dB RMS.
Cavalli Liquid Glass $3,500 - If you want to get crazy with tubes, this thing has dual plates and multiple settings so you can roll just about anything.
(2X) Questyle CMA800R in dual mono $4,000 - Double your amps, double your fun, right?
Cavalli Liquid Tungsten $???? - The best combo I have ever heard with the HD800. Amp is still in development. Release date is TBD.