Every comic I've ever owned with him in it. He never says or does anything except for noble hero stuff, and he's a pretty quiet guy. I'm all for the strong silent type, but he's rarely presented as having much depth.
The best run he ever had was Priest's, where they had the sarcastic government guy as the foil/sidekick to provide all the personality, and T'Challa could just be badass all the time.