Intimidate is very useful at higher levels. Since it doesn't have a save, or Spell Resistance, it only depends on how high your intim is. As a result it is a very effective method of control.
I suggest Human, remember:
Human Dragonmark: Least Dragonmark of Sentinel: +2 Intim
Human Enhancements: Deneith Intimidate (up to +4)
Human Extra Feat: (Bullheaded, or Skill Focus Intim)
Human Extra Skill Points: one more +1 stat / level
as a result, for intimidating, Humans are the best.
However, dwarves and warforged can have slightly higher total HP
A friend of mine build a super-high Intimidate fighter you should take a look at
HERE. Might give you some inspiration.