My thoughts:
Buckyballs: Can you still get the knockoffs? Like Zen Magnets?
Twilight Imperium: Ah, love that game. It's no quick-fire Catan, though. Takes HOURS. Three experienced players playing the shorter variant still kills a long evening, so much so that we house-ruled any experienced player taking more than 2 minutes to do something is allowed to be jeered by the other players until he does something out of frustration.
The expansions are quite good as well - I can't imagine playing without Distant Suns, and the Nekro Virus and the Ghosts of Creuss make for interesting player races. And on small maps the Gravity Drive tech is totally broken, but great fun!
Our games tend to be mostly peaceful expansions until one big orgy of violence on the last two turns as everyone tries to sew up the last few victory points.
Sundial: Handy in some places, but meh. I like my pocket watch! Looks cool, and it's not like I was doing anything else with my watch pocket!