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I just went with an rpm one. Im still on break in but Ill report as soon as I can romp on it and can report any true data. With rpm you get a little more bang for your buck but with dte you get a new case I think. I dont think a z rear will bolt up Im pretty sure its different.
I went with 3.42 because Im an auto and didnt want to get too crazy. A lot of guys with manuals depending on the application have great success with 3.90 and 4.10. I think 3.73 is the more mild application on m6 cars but it really depends on what you want to achieve.
I just wanted a faster car at the strip without going overboard.
I went with an RPM 3.73 STAGE II, very happy so far. I think it's all in where your located. I would try to deal with someone as local as possible, instead of going cross country.
Only speaking for myself, I wasn't looking for cheap.
"Cheap" was probably the wrong word used. We can build our differentials at a lower price because we do them in house, and have been doing so for years. We'll guarantee that you will not find a better differential at a better price, period. We stand behind our rebuilds with our 30 years of being in business.