Night trap isn't that hard to come by, it just goes for a high price on ebay. I think the only real hard games are Darxide and Primal Rage (when was the last time you saw one on ebay??).

31 more games for the Saturn collection. I'm not in a hurry though, so it might still take quite some time. Besides, as you said, I'm too busy basking in Darxide's glory for the moment .

I haven't played all games, since I don't have a megacd. I can't say that I mind though, the cd games don't seem that inviting.

I would say the best (as in 'worth playing') are Virtua Racing, Virtua Fighter, Star wars arcade, Space harrier, Mortal Kombat 2, Metal Head, Kolibri, Knuckles Chaotix, Doom, Darxide and Afterburner. I don't remember much from the other games, and I think that's best.