I'm definately in the vote for the Buff SSJ Broly. A buff SSJ Broly has been a wishlist of mine since I started collecting cels, and sad to say i've never found one I liked.
I'll have to agree with Rob on this one and say the Buff SSJ Broly, that insane nonpupil look in his eyes is just my favorite look. It is a tough choice though since I basically like any Broly that I come across. Hopefully some more will surface soon.