Check out the Daidoji Bodyguard from OA. It requires Imp Init, Dodge, and Toughness as well as BAB 5+ and Lawfull. It gets the d12 HD, good BAB, but only a good Fort save. However, it gets a few class ablilities like Defensive Roll, Uncanny Dodge x 3, Evasion, DR 6/- and a few others that make for a TOUGH guy to take down. Go for it maybe from Paladin for great saves. Or, play a dwarf and go for it. Dwarves get amazing defensive abilities. In that case i'd probably be a Barb/Ftr multiclass.