Classical piano works never get old IMO There are so many periods to choose from: Baroque (well not piano strictly speaking), Early Classical (not really either , mainly fortepiano), Late Classical/Early Romantic, Romantic, Contemporary, etc...
Have you listened to the Shostakovich Piano Concertos?
Dave Brubeck - if you play the piano you'll understand how this composer-piano player is astounding with his odd time signatures and playing style. not much solo pieces, but always very well blended with the other instruments.
Harry Connick Jr does some mean piano work too, with an old-style manly vocal accompaniment.
Bebo Valdes.... all about substance. his technique isn't as strong as his son's anymore, but you should really pick up El Arte de Sabor and Lagrimas Negras.
Chuco Valdes... a bit more flash, but some great latin foundations as well.
Duke Ellington... one of the greatest arrangers/composers, but also a phenomenal piano player.
Billl Evans... one of my favorites as far as style goes.
You'll get your recommendations for players like Corea and Jarrett as well. Great players, but Corea drives me a bit nuts with his overly constructed approach and Jarrett with his very audible vocal cues. Oscar Peterson has some very nice work, but he can get a bit lost on the arpeggios and scales for my tastes.