Richter's recording on DG, already mentioned, is often recommended. You might try a newer, live release on EMI from 2005 with Leif Ove Andsnes, one I like very much. While it has great dynamic range, the recording is admittedly a bit sumptuous and it might sound muddy on overly warm systems. But I like Andsnes's measured approach -- he doesn't sentimentalize but still plays with feeling and taste. It's also available on DVD-Audio.