I would put him in this neighborhood...
Keenan Allen - 4 years for $45 mil incl. $20.7mil guaranteed
Jeremy Maclin - 5 years for $55 mil incl. $22.5mil guaranteed
Allen Hurns - 4 years for $40.7 mil incl. $20mil guaranteed
Randall Cobb - 4 years for $40 mil incl. $26mil guaranteed
A lot of teams should be kicking themselves for not signing him last year. Give him competent QB play and he's probably a top-15 WR in the league. Could see Washington or Philadelphia making a run.
Pryor is not signing anywhere where he'll be a clear #2 option. Find the next Pryor who you can buy low (in $$ and risk). Cordarrelle Patterson, like Mo Claiborne, might be a slow learner who is finally putting it together. Honestly Brice Butler might be the next best value-to-high-ceiling signing we can make.