60GB with hardware retro support. It rocks, black monolith and all that.
What I miss is the Linux bit that got stopped abruptly, and what I also miss is the ability to load all my PSX games onto the internal harddrive, which was a brief but very, very satisfying experience.
Now, ever since going back to legit and official firmware, the void could only be filled with emulators on PC, which allow for overcoming artificial (regional) locks, and even play the games at higher resolutions and emulate the visual peculiarities of bygone CRT tech, which is splendid fun - especially since only very few retro game rereleases allow for such - essential - trickery.
I've stopped re-buying my old games on PSN ever since I repeatedly got handed censored/crippled/localized versions of games without warning, and I don't like the concept of randomly throwing money at things I already own.