dont forget Code Veronica though, also available on gamecube, ps2 and dreamcast.
I think If I were going out and buying them, Id get 2, 3 and Code Veronica on Dreamcast, if I could find them, I dont really know the differences between the different console versions, but I know that the VMU Screen displaying your health and maybe your ammo (its been a long time) is a nice feature, and the DC controller (one of my least favorite along with the 64 and Jaguar) doesn't hinder playability.
-mal