Most of my brewing is either US-style pale/amber ales, Belgian-style ales, or German-style lagers, so bear that in mind.
By the sack:
US 2-row Pale
Ger. Pilsner
Ger. Munich I
Moderate quantities (<5 lb):
US White Wheat Malt
UK Medium Crystal, ~60 SRM
Ger. CaraVienne, ~20 SRM
Small quantities (<1 lb):
Ger. CaraMunich, ~50 SRM
Bel. Special B, ~150 SRM
UK Extra Dark Crystal, ~150 SRM
Ger. Munich II
Pale Chocolate
Chocolate
Black Patent
Roasted Barley