I've been a huge fan of Menzerna polishes since the days when Intensive Polish and Final Polish II were the "IN" polishes. My current favorite polish right now is Super Finish (PO106fa). It has very good cutting power and finishes down really nice. Personally, I can't tell the difference in finish between PO106fa and PO85rd, but it definitely has more cut.
When I talked to the Menzerna rep. at DF 5, he told me PO160fa is supposed to finish down just as well as PO85rd, but since it has more of the same abrasives found in PO85rd, it is a lot more effective at removing defects.
From my own experiences, Power Finish has more cut than Super Finish, but it doesn't finish down quite as well. I use Power Finish for light colored cars (I can't see the haze Power Finish leaves on light colored cars) and Super Finish on my dark cars.
I've used both Power Finish and Super Finish with the white LC polishing pads. I reserve the orange cutting pads for M105 & UC.
I've used M205 and it works well, but I personally find Super Finish easier to work with. I've had a hard time getting M205 to finish down as well as Super Finish.
I've used Poorboys' SSR1 (old formula) once and it worked well, but it didn't have the same cut as Super Finish. I also have SSR2 (old formula), but I haven't used it yet. I would like to know how SSR2 compares to Power Finish and Super Finish.