I'd buy an HD remake of Metal Wolf Chaos in a heartbeat.
This would be astounding.
I'd like to see Parasite Eve redone, especially if it were to fall in line with more modern shooter/RPG hybrids. If the game were to use something like the Unreal 3 engine, it could work spectacularly. The other option here is to go the route of the sequel, and use Capcom's MT Framework engine, like the modern Resident Evil games. Either way would work, but balancing the power usage would be more difficult here, though the game would probably better retain the survival horror feel.
The other game is Koudelka. The idea of an RPG/Survival Horror hybrid is fascinating, but the game's execution was very flawed. With modern technology I think it could be pulled off.