Don't know much of/about Bartók yet, but Lipatti's version of the third piano concerto (Orchestra of the Südwestdeutsche Rundfunk, cond. Paul Sacher, rec. 1948 in Baden-Baden) is amazing!
It can be found on the Lipatti EMI ICON box, which contains plenty of other great recordings (Chopin, Mozart, Bach, Schumann, Grieg, Liszt a.o.).