Depends on how many batches you want, but definitely:
Base Grains:
2-row (Canadian)
Maris Otter
Pale Wheat
Specialty Grains:
Crystal 110, 150, 240.
I'd go with 2:1:1 ratio on the base (whole bags are probably best), and 1/5th of that amount of each of the crystal (i.e. a fifth of a bag each). That'll give you a suitable base for all three of those beer styles, with some room for experimentation.
Others in the club will no doubt give you access to other specialty grains if you need them for a particular recipe.