I have 40-50 different types of spices in the kitchen, but I tend to use the same few mostly.
Not really a spice per say, but I like the minced garlic in a jar. I'm talking about the kind packed in water, that you have to refrigerate after opening.
Garlic powder - are you seeing a trend?
Dried minced onion flakes
Cumin - for chili and white chili
Celery flakes - for soups, casseroles, etc
Celery seed - for pasta salad, coleslaw
Fresh ground salt & pepper - I buy the big disposable dispensers at Sam's Club.
Tony Chachere's Creole seasoning - for Spanish Rice, etc.
Dried cilantro - for Spanish Rice, chili, taco meat, etc.