A lot of orchids have nasty scents – mostly the ones that are pollinated by flies. Most of those are in genus Bulbophyllum. They have all kinds of nasty. B. echinolabium smells to me like moldy Saltines, others smell of old fish, or rotting elephant (the famous B. phalaenopsis).
Two Bulbos which smell really good: Bulbophyllum macranthum (smells like cucumber and cloves . . . strange, but very nice; enchanting) and Bulbophyllum ambrosia (smells strongly of honey).
Overall, though, my favorite scent is probably just the Brassavola nodosa. My SO is not as taken with it as I. She smells it and says "Ah, eugenol."