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...