Perfect Dark (remember it was running in 640*480), Turok 2 (also with the Hi Res), Banjo Kazooie and Majora's Mask. I'm tempted to give Rayman a nod as well for a great marriage of tech and art but technically it probably wasn't quite as strong as the others above.
DK 64 looked really good but I remember feeling a little let down that it didn't quite stack up graphically to Banjo Tooie. Tooie definitely had more frequent use of high res textures and I preferred it's style.







