I've also joined the PanAm owners club! I saw the sale and decided to risk it even though I've seen mixed reviews with the HD800s. I got the Passport as well and they should be arriving on Monday. I originally ordered the black version but apparently that's discontinued, so I ended up getting the silver version.
ALO only had the Radiotechnique tubes available as optional extras, so I've bought those in case they turn out okay (they were cheap enough), but I'll try and source some Mullards too as those work best in my Earmax.