All of the Riverside recordings are well worth having: Portrait of an Artist, Everybody Digs Bill Evans, Sunday at the Village Vanguard, Waltz for Debby, Explorations, Moonbeams and live at Shelly's Manne-Hole come to mind immediately.
The later recordings, mostly on Verve, are also very good and highly regarded (Conversations with Myself, etc.), but not quite on par with the above, IMHO.