There have been so many great recommendations here, so I only have one other one to add that I don't think got mentioned, and that's Keith Jarrett. The latest CD Whisper Not is a great place to start for his trio stuff, and The Melody at Night for his solo work. The only bad thing about many of his recordings (the ones I mentioned aren't too bad) is that he makes weird vocal noises that get picked up on the recording.
Columbia's latest remastering of the Miles Davis catalog on CD seems to be on the "hot" side for some reason, at least on some of them. The earlier CDs didn't have this problem, they didn't have the detail either, but they might be easier to take if the new one bothers you. I agree, the Sketches LP is great.