Neal Adam's Angel 

Silver Age Captain America 

Gil Kane's Green Lantern 

Neal Adams Green Arrow

JB's Wolverine 

Mysterio

Thor (Classic design)

Spider-man I'd have to add as an honourable mention as I love both the original Steve Ditko design and Zeck's take on the 80es Black costume. (There was a period during the 80es when he was switching between the two depending on the writer/artists preference for the story and it was great!)

But even though I technically prefer both more than a couple of the entries above, I'm 50/50 on them, and couldn't possibly choose between them. So effectively they both cancelled each other out. Since I didn't want to give two places to the same character on such a shortlist!

Batman and Spider-Man are close runners-up. With Batman I actually prefer the yellow insignia, the way Adams and others drew him, but I can easily live with the more stripped-down bat symbol - the way JB drew it in the MAN OF STEEL mini-series. (And I think perhaps JB did this before it became the standard again?). 

Black Panther (classic version)

Cyclops (original black and yellow uniform)

Mr. Fantastic (negative version)

Spider-Man (original black and red version)

Oh, and I appreciate those of you who kept your selections to four or less. It's easier to list more names, but requires some thought to play by the rules.

QUOTE: Is that with or without the cape, Wallace? And do you prefer the blue or the grey highlights?

I prefer T'Challa sans cape. I'm okay with blue or grey highlights, but prefer the former, particularly when BP is in the company of colorfully-garbed peers.