What do you think of this trade.. I need WR depth..?

I think if you can get it, you're definitely getting the better end of that deal. You don't need Rivers with Big Ben; Bowe is a fantasy surprise (and is probably equivalent to James's production at this point). Colston has much more upside than Davis (who will lose looks now that Johnson is back) and Northcutt (who is really a fantasy dud). Go for it.