Quoted from TreyBo69:Edit oh and Voltan. That may be very likely. Super rare
THIS^^^^
Voltan would be an excellent choice for reproduction for several reasons:
1) Rare title & hard to find
2) Already has a killer lost David Christensen art package
3) It has a basic layout & has lame lame sounds/rules, but that could be VASTLY improved with new code.
Same goes for Spectrum. A unique killer-art package with tons of insert options that could be recoded into a whole new game. I'd bang out Centaur & EBD first though.