It isn't too often I get to gloat a little, but.... Let me start off by saying that I know I am shallow because I can't even remember any real small ones, either I block them out or (more than likely) when I see how small it is, I dont play.
Anyway, I think I win for the thickest. I was down in Parliament House in Orlando years ago. I always got a room on the 2nd floor facing the lake and laid my self out on the bed butt up. One time when I was there, this youngish guy, just out of high school came by and saw me. Normally guys just walk in. This guy was so sweet, he asked me "can I enter you?" I had no idea what he was talking about. Turns out he meant "can I fuck you?" He was a mix, but part American Indian and because of his dick, I go instantly hard when anyone's profile anywhere says "american indian" in it. He unzipped and pulled out a dick that was probably only 6 or 7 inches long, but it was definitely wider than a beer can. It has to be the thickest I have ever seen (actually by a pretty decent margin). I was surprised I took it, and it felt great getting fucked once he got me open. I played around with him the next few times I was in Orlando. In fact, I took him to Disney World one trip and I blew him in the backseat of what was then called the "People Mover". Tom if you are out there look me up. I'd love to get to "know" you again. You are still the man of my wet dreams.
I also am pretty sure I win for the longest. The only problem (well not the only, LOL) was that he wouldn't fuck bare. I was trolling around on the old party phone lines in NY and I met a guy who said his name was Jonah. We chatted a little and intriqued I went over to his place. At the time he was living with his mom. They had a dog. I will tell you the his hygiene wasn't exactly the greatest and the apartment was a disgusting pig-sty. However, he pulled out his dick and I was hooked. He is somewhat known on the internet although I didn't know it at the time. Google "Jonah Falcon" Apparently he has now decided he is straight. That being said, some lucky woman is getting fucked by a guy with a 13.5 inch dick. (For those who are interested, despite the condom, I did get him all the way in me, and I will vouch for the fact that it is 13.5 inches).
I've also had some other pretty big ones. I had a white guy at the baths who was packing 12, and another time a guy packing 11.5. What can I say? I will take them as small as 6ish, but I definitely am a size queen.