Custom Curtis FR with 150mm U turn revs and pro2's/Stans flow would be my choice.
Had 140mm Fox van 32 originally on my Curtis FR and was nice but prefer RS forks to Fox, got a set of Pikes on now. Gary recommends head angle at 71 deg and mine is 68 deg with Pikes set at 140mm (no sag) so with sag would be about 70 deg? Looking at getting another built up in the next month or so and would get the head angle a bit slacker. saying that with the current forks/head angle its a fantastic "do it all" bike just wish it was a bit lighter.
BFe would be fine for all day rides, assuming weight isn't your first concern. It's not super heavy anyway. He might want the extra stiffness and long fork handling of a bike even burlier than the Soul.