Shoutbox

DES is definitely inferior to Triple-DES which is in turn inferior to the rest.

RC6 was the candidate for the competition for the AES standard (the current AES standard was originally named Rijndael when it was just a candidate, fyi).

I'd personally choose Blowfish because according to wikipedia no  good cryptanalysis has been done for it; AES is more widely used and so more people are looking into how to break it so maybe you're at more risk to be cracked .