I also liked him in his civilian cloths. His solo comics from the early 00's by Teri and Ruka was him at his best.
I also wasn't a big fan of the yellow. I thought the classic suit was only good depending on the artist. Lee made it look great, but under Cockrum and many other artists it was ugly.
Brown and tan was great, but I'm not a big fan of the current updated version. I think it would of been better if they just removed the trunks, akin to his look in Evolution.
I was actually a big fan of the look he had in the early/mid 00's, that he used across all titles, but is probably most remembered for being his second Ultimate suit.