Depends if you want better cooling or more silence? .... for better cooling you will need a fan with a higher CFM, if it silence your after the you need lower CFM .... i have a 92mm Vantec Thermoflow with a 58.5 CFM .... its not that loud and keeps my card at 48c - 50c idle & 65c max load! .....
If it was me i wouldent choose any of those fans! .... i got my fan from the below shop!
Not knocking ebuyer, i use the store & forums alot(bought most of my system parts from there)and its one of the best(lowest priced)on the net but they dont have the best selection of fans.