Yeah, a lot of the games have English options, but there are compatibility issues with some of the Towns games to Marty games due to need for increased RAM capacity, and the rarer titles are higher than $200 these days on Yahoo when they show up. The Lucasarts games in particular can get pretty high (Indy games) in particular.

AS far as someone fixing the belts, contact Dream Stars Japan on eBay, he can get them fixed and even sells formatted floppies for saving games on your Marty.