I started with .125 and it was plagued with instabilities and some lag.
Updated to .162 and it was like having an entirely new device.
Today I jumped to .185, mostly because I was going to modify the Blackberry.alx file to unlock the vendor themes (mostly a waste of time - not much there) but also to have a more current OS installed. It's even better than .162, much snappier, and I didn't think that was even possible. Go with .185 as it seems more stable than .190. Cutting edge is good, bleeding edge hurts!