hynek,
The M20x has been out for over a year, so I figure Sharp is due for a new version at some point here. You won't see 3-chippers for anywhere near that price for a while. If you don't mind going from a 3x wheel to a 2x wheel I think there are some options that are close to what you want (not a whole 50% brighter, but might seem like it with better CR, though). However, if you want to stick with 3x or higher I think you are going to have to wait for something.
--Darin
The M20x has been out for over a year, so I figure Sharp is due for a new version at some point here. You won't see 3-chippers for anywhere near that price for a while. If you don't mind going from a 3x wheel to a 2x wheel I think there are some options that are close to what you want (not a whole 50% brighter, but might seem like it with better CR, though). However, if you want to stick with 3x or higher I think you are going to have to wait for something.
--Darin