When Brandon Marshall was traded to the Dolphins back in 2010, he was 26 years old and a top-5 receiver in the league (basically, what Bryant is now). The Fins got him for two second round picks. I think that's a good benchmark.
Remember, when we traded Revis he was considered the best cornerback in the league (albeit, coming off a torn ACL) and the Bucs were the only team willing to give up a 1st and a conditional 3rd while paying Revis $16m a year.