I totally recommend McCoy Tyner's "Echoes of a Friend".
His rendition of John Coltrane's "Niama" is one of the great piano accomplishments of all time.
But don't give up on organs, currently one of the best deals in this economy.
I only jam out in Cm on keys, keeping it easy, but bought a Thomas Organ for $25.
Good luck!
as always, John Watt