For the TG-16, I'd pick:
Bonk's Adventure
Space Harrier
Keith Courage In Alpha Zones
Blazing Lazers
Tiger Road
Getting a Turbo Tap and Bomberman isn't a bad option, either. I don't own one, myself, but I'd love to.
For the CD system, you're on your own.
I'd kill to get a PC Engine with a CD attachment, but they're expensive as hell...