I like the R Murphy New Haven (bent tip). Works well for thicker hinges and deep cups. For smaller/flatter/delicate oysters, I like a short flat blade. R Murphy and Dexter-Russell have a ton of different profiles and are cheap, so it won't break the bank to grab a few different patterns.
I think some guys here also like Toadfish. There are some made in France oysters knives that are nice too (flat, short pointy blade).