Arthur Brown is the guy I want the Broncos to get, but he's likely gone by 28. I like his speed and tackling ability, plus good in coverage. I'd be happy with Te'o though since I think he's a guy teams are talking down hoping he'll fall to them. Carradine is intriguing but coming off and ACL injury, so taking him at 28 is probably not wise unless completely checks out in physicals. The Broncos have had a history or taking injured players and it not working out well.
I like Cyprien and Elam at safety too, though trading down for either would be the better move.