My prime kit now consists of 16(fisheye),24,28,35,40,50,85,90,100, 135,150, 200, 300, 400 and 500.
I tend to prefer wide spacings between primes when I'm carrying them. One of my all time favorite kits in 35mm (Leica M gear) was 21/35/75. I do this with the DS now by carrying 14/28 [or 35]/50 or 24/50/85, depending upon which range I'm in the mood for. I think I carried the 24/50/85 kit at the NorCal PDML gathering day, got a lot of good photos with it.
Godfrey

