Let me preface this by saying I have a ridiculous amount of spices. I have three spice racks...yes...three. One large, one medium and one small and they all surround my stove. Insane. Some of the spices are doubled up, usually the ones I use constantly. Quite a few of them were bought for one specific recipe and then sit to be rarely used again, just shuffled around but I can't bring myself to throw it away, they are expensive! And you never know which one of those oddball spices are going to put your dish over the top! More than once i've said "hey what's this? Eehhh throw some in!" and it turned out to be the magic touch.
Spices that I keep on hand always:
Tony Chachere's Original Creole Seasoning
Slap Ya Mama Cajun Seasoning
Onion & Herb seasoning Mrs. Dash
Crushed Red Pepper Flakes
"The Important thing is the spices. A man can live on packaged food from her 'til Judgement day if he's got enough rosemary." -Shepherd Derrial Book