cfire,
There's only one that I know of, which is the one you mentioned that's posted on this site. I'm sure any of the aftermarket sunroofs, when properly installed, will not leak. The big concern I would have is how it would affect the continuation of the centerline of the car. I can't imagine any sunroof that could pull it off. That is why I believe this car does not have the option of a sunroof

However, what I think *would* work nicely would be a T top. You would still have the openness of the sunroof over each seat and be able to keep the centerline of the car in tact. It would require a lot of custom fabrication done by a good shop but the end result would be stunning. Or of course you could trade your Coupe in for the Roadster. ;-)