Pre Reebok "NFL Equipment" jerseys (ie those with just the small shield on the neck) are the way forward. You'll never find a fake one - anyone that has botched together a fake Barry Sanders would stick a Mitchell and Ness tag on it.
The only thing worry is that somebody will have tried to put there own numbers on it (or put the name on without a nameplate) and have done it wrong - font, size, material etc.
That Paup looks good too - much better cut than my Champion one which is like a dress on me:
The Wilson jerseys are good quality from what I've seen (I've got a Wilson Rodney Peete Eagles jersey) - much better than Logo Athletic or someone