after i get loaded up at the store, i like to have two pounds of c20, 40, 60, 80, 120. a pound of chocolate malt. 2 pounds of carapils. 10# wheat, 1# roasted, 1# rye, 1# flaked wheat/barley. 2# flaked corn. and maybe some special b, aromatic malt. That way i'm set for whatever i feel like brewing.
It may be a little overkill, but i hate to delay my brewday or make a special trip because i don't have a 1/4 # of some malt.