Hello mrfatboy,
There are quite a few good quality manufacturers of aftermarket soft tops. First thing to look for is "original German Cloth" with the correct reverse side matierial. (forgot the name). The original tops will have original factory trademarks on the clear plastic window which the aftermarket tops may not be able to reproduce legally. This will cost you a few points in a National Show if that is a issue.
Some good quality aftermarket tops come from K&K Manufacturing, Bud's Benz, Electron Top Co., Robbins Top Co., and Bill Hearsh, Millers.
Insist on original German material inside and out. The best price you will find, uless you get lucky, will be around $350.00 to $400.00.
Proper instalation of the top will have the biggest impact on quality.
Joe Alexander
Blacklick, Ohio