Of the lenses currently in my kit, I would have to go with one of the following sets.
Set one; 20mm f/2.8 AIS, 85mm f/1.4 AIS, and 180mm f/2.8 AIS ED.
Set two; 20mm f/2.8 AIS, 35-70mm f/2.8 AF-D, and 180mm f/2.8 AIS ED.
And a third set that includes one lens that I'm currently looking for, the 35mm f/1.4 AIS. This set would be for low light/available darkness.
Set three; 35mm f/1.4 AIS, 50mm f/1.2 AI, and 85mm f/1.4 AIS
I would want to have my FM3a with me because I use it more that I do my N90s.