Of those mentioned, Elite most piques my interest, I loved that game!! Killing the bastard that snuffed dear ole dad was SATISFYING. It tooks months of play to build up my ship, and in the end, I had military lasers jutting from every hardpoint, the best shields and engines money could buy, enough cargo space to haul a planet's worth of sla...er migrant workers, and well, you get the idea.
I think someone needs to go back and take a long hard look at what was made for the C64, and reproduce nigh-on all of it for us. Most of the Epyx games simply shriek out for renewal, and who here would not love to sit their friends down and play a round of Caveman Ugh-lympics? I wouldn't mind seeing Dragonriders of Pern make a comeback, the mix of diplomacy, strategy, and action was really fun. Gunship was probably the only flight sim I'll ever love, well, other than Elite, anyway.