Tough to choose between these two:
The red is an L-code that sparked my enjoyment of grilling on charcoal and my loyalty to the Weber kettle. It was purchased by my neighbor, gifted to my sister who learned to grill on it. After she had it, it became my first grill. I lived in a house with some friends for a couple years and that thing saw a steady flow of burgers, hot dogs, sausages, and steaks. It's been cleaned up since this picture, but is still pretty beat up. I don't think I will ever be able to part with that grill.
The other one that I doubt I could part with is my performer. It was a gift from my wife, it's my workhorse, and thanks to this place I have vastly expanded my grilling menu/abilities using this grill.