Ferrix, the horse in the ECS was not a warhorse, here is how I would see the stats for a
Valenar Warhorse
Large Animal; HD 3d8+9 (26hp); Init +2; Speed 80 feet; AC 18 (+2 Dex, -1 Size, +4 Natural, +3 Armor), flatfooted 16, touch 11; Bab +2, Grapple +8; Atk +5 melee (1d4+3, hoof); Full Atk: +5 melee (2 hooves 1d4+3 and bite –1 melee 1d3+1); SQ: Low-light vision, Scent; SV Fort +6, Refl +5, Will +3; Str 16, Dex 15, Con 17, Int 2, Wis 15, Cha 10.
Skills and Feats: Jump +24, Listen +4, Spot +4; Endurance, Run.
Tricks: Attack, Defend, Down, Heel, Stay, Come, Guard
Carrying Capacity: A light load for a light warhorse is up to 230 pounds; a medium load, 231–460 pounds; and a heavy load, 461–690 pounds. A light warhorse can drag 3,450 pounds.
Possessions: military saddle (20gp, 30lb), masterwork studded leather barding (250gp, 40lb).
I gave him Max hp for his fist hit die, so his hp stays the same.
He looses "Improved Natural Attack" but I included bite to his full attack.
His AC went down, but his saving throws went up (I don't know were you got those #'s)
I left him with 7 tricks.
Traditionally a warhorse costs twice as much as a riding horse.
A Magebred Animal cost twice as much as a mundane animal.
So even if I was allowing a Magebred Valenar Warhorse (which I am not) the cost would be at least 2000 gp.
So are you in?