For us, the ones we'd really like to see are either an update of Skies of Arcadia, or some new hotness from Streets of Rage. We'd forgotten that game even existed until the picture slapped us across the face. Punching and kicking at its best.
What Sega classics (and we're using that term lightly) would you like to see? While you're busy wishing, Joystiq wants a solid gold PlayStation 3. Just a little holiday FYI.