If the offroad includes all its guts, I would definitely restore that one. If it's missing everything, your only choice is to MAME it since it's not a JAMMA cab. I had a gutted Championship Sprint that I MAME'd and it turned out nice. I was very careful about what I did to install everything so it could be converted back easily, but I doubt that will ever happen.
Vapor Trx definitely looks cool, but I don't know anything about it or the others. Like Ginsu said, I don't know what you would do with them other than restore them.