If you do anything with RF, standard range inductors and chokes are a must.
Digital?
Be well-stocked in the 74xx, 74LSxx and 40xx lines.
I have a bunch (and I do mean a BUNCH) of caps, precision half-watt resistors and the like; I'll never use all of the particular values I have on-hand. A goodly-sized assortment is yours for the cost of postage.