We need all of the stats, unfortunately.
So it's best to select what 'role' you want to be best at, and concentrate on that.
Don't mind being a healer? Go int and spirit.
Want to use bear alot? Sta/Str
Cat? Str/Agi
Alot of druids keep multiple sets of equipment set up for each form, and outfit themselves according to what form they will use the most.