Andre Previn & Vladimir Ashkenazy recorded all 4 PC's in the early 70's. If you can find them, enjoy. They are still highly regarded. Byron Janis recorded #2&3 on Mercury Presence, and then there is Earl Wild set with Jasha Horenstein, another highly regarded set. And if you can find it, Sviatoslaw Richter's version on DG, ain't chopped liver, circa 1959 (again if you can find it). Personally I think Ashkenazy rules in Rachmaninov, symphonies, piano, and Symphonic Dances. The suite for two piano's done by Ashkenazy & Previn is excellent as well. Happy hunting.