A superb conductor that I've the fortune to hear in concert is Lawrence Foster. Foster is a strong advocate for the music of George Enescu, and has recorded much of Enescu's orchestral works (including the opera Oedipe) under EMI (now Warner Classical). As you might expect, these aren't exactly stuff that tops classical charts, so his recordings tend not to stay in catalogs. However, it was not his Enescu that I heard in concert, but his absolutely majestic rendition of Elgar's Enigma Variations. I've heard this work at least a dozen times in concerts and never have I been so moved.
One of my fondest memory of solo-piano concert was given by Joanna McGregor, playing Messiaen's Vingt Regards without an intermission (followed by a fiery encore of Piazolla's Libertango). This is a physically very demanding work; to complete it in one go is already a feat. To play with such clarity and eloquence as McGregor is a miracle.
I really wish there are more recordings by pianist Michael Endres, as his recordings of Mozart and Schubert sonatas are top notch.