My current 3-saw plan....
018 w/14" bar 3/8LP .050 semi chisel
MS260 w/18" .325, .063, Full Chisel
066 Mag. w/28" 3/8, .063 Full Chisel Full Comp.
I always take the 018 and 260 to the woods with me. I'll take the 066 too if I have some big stuff to cut (18" dia +). As soon as I finish...