Most iconic to me would have to be the 110, the 184 and lastly, the 186 as when they were released, no one else had anything like them...at least to my knowledge.
My personal favorites are my 560 I found at a gun shop in a junk box, a 192 with a stag handle I am in the middle of negotiating for, and a 639 Fieldmate...the first new fixed blade knife I ever bought.