I have a few years on 30mm Cinch cranks, 170mm Turbine and 165mm SixC with a short spindle (mine arrived with a DH spindle). I have been happy with both. The RF BSA30 BB sucks, but there are good alternatives on the market, Rotor being my favorite. My friend has the Aeffect cranks on his trail bike and never had a problem IIRC, although he may have had to buy the self-extracting bolt for the drive side crank.I've been wanting to go to 165mm cranks for the past year or so. I'm currently to 175mm SixC w 24mm axle. I'm quite happy with the Cinch system and have it going on three bikes now, which means I have spare parts as needed.
RaceFace is out of 165 SixC cranks. They have 165 Aeffect R, and 165 Atlas. I'm not sure whether to wait till the SixC eventually come back in stock, or to pick up Aeffect R or Atlas'. I like the price and weight of the Aeffect R, and NSMB reviewed them favourably. Anyone here have time on them?