With Larry Young's Unity you get 3 of the above-named artists! As well as one of the great '60s Blue Notes.
Tranewreck, it took me close to 40 years of jazz listening before I could warm up to Tatum's pyrotechnics, now I love him, so I've been listening to a lot in the past year playing catch-up.
Probably my top jazz artist would be Mingus. My first jazz concert was the Mingus show that resulted in Mingus & Friends at Philharmonic Hall, when I was 16.
A couple of my favorites not yet mentioned: Mal Waldron, Paul Bley. If any jazz pianist could be called the antithesis of Tatum, Waldron would be a candidate.