Anime that has never come to the US

You can count on a good number of new anime releases to make it here.  But what about older stuff that's never made it here?  Or even new stuff that hasn't had any indication of being picked up? What would you like to see brought over?

I want to old super robot classics, like Getter Robo, Mazinger Z, Great Mazinger, UFO Robo Grendizer, etc.

The problem is... how would a company release them?

While the idea of buying all of Mazinger Z rocks my socks, how does a company release and market a 92 episode show from the 70's, and is there even a real market for it that would make it worth releasing?