None. If you have a straight, great niche keyword, they all will do. If not... ".TV" maybe. It's the only other one that is memorable without having a key word in it. ".ME" only if you have a good hack, or your own name. I don't even like .net that much. Without having a Great, and I mean GREAT keyword or niche, the average person does not remember obscure letter combination's, jumbled words, and different extensions. .com will always be the most marketable, just like a radio station starting with "K" or "W".
.info .us I guess if the domain is extremely premium one word I would consider, but even then I would think of it twice because of the cost involved. They really went greedy!
.info i think its the cheapest domain out there... so for any cheap project i just use .info but for real business ill use .com, imo nothing beat .com
I always opt for the .com when available but if its not and I have to choose between the .net and the .org I like the .org better but I will also buy the .net to be safe.