I've gone ahead and bought the SE version of the HP8 mk2. Still burning in (currently around 70hrs) but I'm quite impressed so far. I'll post some impressions soon, I'm just waiting for a new cable so that I can hook it up to my DAC alongside my v200 and switch easily between the two. So far my ears are telling me that it will give the v200 a run for its money.
The SE version uses Treasure CV181’s in place of the standard Shuguang 6SN7s’ - these are a direct replacement - and a gold pin JJ 12AX7/ECC83 in the front end. I also have a NOS ecc83 tesla on the way which will be interesting too.
Like project86 I think it shines with the HD650s but I've been using it mainly with my LCD-2r2s.