I am not sold on Bulaga, mostly because he keeps getting hurt, as opposed to Sherrod, who got hurt once, very badly. Why that seems better than Bulaga's regularly getting hurt, I don't know, but it does.
Bulaga seems a solid right tackle, but not built to take on the speedy rushers, whom I think appear more often in front of a left tackle.
If he can cobble together a season like the one Patler described, and if Sherrod stays healthy this season, I'd keep Sherrod and let Bulaga go to the Arizona Cardinals, or whoever it is that will overpay for him.