Imo, if you want to be cool around the younger bunch, a TLR beats everything in the cool department, it's so different to anything else that it just stand out.
It doesn't have to be a Rolleiflex 2.8F, even though they are the coolest ever, from a APUG-nerd standpoint. (white face is ultracool if you are a collector, but I digress....)
A seagull, cord' or a yashica TLR will do perfectly well, and if you really want to impress the Lomo-crowd, bring a Chinese You Yi TLR =)
The Soviet counterpart of the Voigtländer Bessa I and II is also a camera that would fit nicely on the "cool wall", the Moskva V, even though quality and ease of use may be a whole different story ^^