My quick answer is a Cowboy's jersey, is a Cowboy's jersey. But hindsight is 20/20. If you can wait to get the RW jersey in your size, then wait. If you need it by christmas, .............a cowboys jersey, is a cowboys jersey.
Tell that to all the guys who rushed out to get a Antonio Bryant jersey #88.
Personally, I'd either hold out for the Roy jersey when it comes in or I'd go for a Newman or Canty jersey...you can count on those 3 guys for years to come.
I got 4 Roy Williams authentics already, my next one will be Ware, Newman, or Barber, assuming he continues to play the way he has been recently. But right now I'm leaning toward Newman.