Would you say that something like a Zana deux se, wa22, dna stratus would be better than a rag?

Zana Deux is tricky. Although OTL with euphonic luxurious kind of sound, it also tends to be the sharpest in terms of treble among the EC amps. On a relative scale, no where as sharp as some SS amps, but just be something to be aware of. If ZD, I'd consider the use of replacement (copper) cable with the HD800 and/or a DAC without any digital edge.

DNA Stratus is warm and tubey, but done in a most tasteful way. HD800 do work out of the Stratus. The "wet", intimate nature, and microdynamic ability of the Stratus is a good match for the HD800. You can roll all sorts of 2A3s to get the sound you want too. My favorite is the more solid-state sounding EML Meshes for a taut bass. Many others I have observed prefer the bloomier big tubes Shuguangs.

WA22 doesn't quite sound as good as the above.

Rag is interesting in that its smooth treble and technicalities are unsurpassed for a solid-state amp, this is good for HD800, but tonally Rag is lean in the bass with the HD800. One solution may be to add resisters in series to artificially bump up the Rag's 0 output impedance.

Or the Valhalla 2. Stock tubes are very good. Some of the 6922 type NOS can give some improvement. But I wouldn't spend a lot, especially if you are going to be upgrading.

There is like only person who hypes that thing because it's one of the few amps he's owned or listened to. Some Canadian with a black belt or something.

LOL. So bad...

Considerable.

Also, keep in mind that Valhalla 2 tends to be more solid-state sounding than most people expect. It is not warm and gooey. It's resolving and clear sounding. There are at least two people I know who reverted back to Valhalla 1 because of that.

True with stock tubes for sure. Some Amperex 6DJ8's can bring some tube warmness back,  but not too much gooey.