Since you seem to like Haydn, maybe you should give Andrew Rangell a
try. I haven't been able to play much of the Derzhavina set yet, but I
did play all of the Hob XVI:20's I could find on Spotify last week (or
at least I played part of all sonatas). And Andrew Rangell's stood out
as one of the most extremely individual interpretations. A little too
extreme to be a top favourite of mine as yet, but certainly worth
hearing as a different take on the sonata.
A friend was very taken by Beghin's version, which is also from a
complete set. I like it too, but it's played on a (to me) rather
unpreposessing fortepiano. His interpretation may be more varied and
interesting, yet I'd rather listen Staier's take on a beautifully
recorded and wonderful sounding fortepiano.
I don't dislike Brautigam, but I think he comes third after these two.
He's lively but less varied, just a bit less interesting than Staier and
Beghin -- at least that was my superficial first impression.
In order to facilitate finding different peformances, here's a playlist
of all the XVI:20's I could find on Spotify:
http://open.spotify.com/user/franklekens/playlist/4Td15RwqSDaF07jeIe4OCN
They're in no very particular order, except that a handful (about 10 or
so) that I really didn't care for are at the bottom of the list.
(Obviously, there are more pianists playing Haydn on Spotify; only no
XVI:20 by them.)
I don't find Buchbinder as dull as you say he is. From the little I've
heard so far, it does seem Derzhavina's set is better than his; but at
least he's more interesting than Jeno "playing it straight" Jando, IMHO.
I was a little disappointed by the Andras Schiff; I remembered his Haydn
set as being more interesting than what I heard last week. Maybe he
suffers from the comparison. (It's always a little weird comparing many
different versions one after another: that's not what you do in the
concert hall, unless you have a perfect auditive memory of performances
you've heard before.)
Koroliov's 20 was good too, I thought, and Kasman's.
(And of course there are some terrific 20's that aren't on Spotify:
Kocsis, Egorov, Weissenberg, and Richter probably -- I don't currently
have that.
And one pianist who hasn't been mentioned, but who seems to be recording
a complete cycle: Bavouzet, on Chandos. What I've heard of that is very
lively and interesting as well. And nothing glib about it, IMO.