OB1 or OB2 with your choice of a soft tip.
The difference between the OB1 and OB2 are 12.75mm vs. 11.75mm tip, and pro taper vs. conical taper, respectively.
I have both and I notice very little difference between them (I thought the tip size and taper would be very different, but I guess it's just not a big enough difference to notice...to me, anyway).