Rationnally talking paul mac has been the most diverse releasing stuff on label ranging from ongaku to warmp & coda, going through the "prime" styled labels.

Marco Carola (with his domino poject, but also on his earlier question b sides) is doing pretty well his minimal reconversion, though keeping stuck in the same formula once it works.

Beyer has done less than 5 records not sounding swedish compressed techno so i dont really take him as an example.

Beltram is quite varied though an obvious lack of taste hmmhmh Lets quote Luke Slater in the same feeling.

Except these people and a few other mantionned in this thread (Mills, Dahlback...) it is true techno producers stay in their own sound, but as a young producer, i think this is the hardest part to achieve : "make your tracks sound in a way everybody can identify its you who are producing it".
Whatever, as Adverse says, we all make techno.

To me, diversity is really more important in a dj set. A producer has to make his records coherent, create his "own sound" and is also limited with the gear he uses to produce. But a DJ only has his ears to chose what he can play, and in the amount of records he gets/buys he can try not to select the same style again and again.