If you want to be a grapple monkey, go Half-Orc Monk. Put your highest stat in Str, get Improved Grapple as a bonus feat at 1st level. If you put a 12 in Int, it will be decreased to 10 and you'll still get 4 skill points/level.
As a half-orc, you'll get Darkvision, meaning you can strike in complete darkness. You'll get a bonus to Str, and no penalty to the two key monk abilities (Dex and Wis).
By the elite array, you'll be looking at:
Str 15 (17) Dex 14 Con 10 Int 12 (10) Wis 13 Cha 8 (6)
With these stats, your AC will be 13, your unarmed strike will be +3 attack, 1d6+3 damage, and your grapple check will be +7.
Get Tumble up to the point where it enhances Fighting Defensively. Get Improved Natural Attack (unarmed strike) at 6th level, when you qualify for it. Boost your Strength to 18 at 4th level, then boost your Wisdom to 14 at 8th.
Get potions of mage armor as soon as possible. When you have enough cash, comission bracers of armor. Get a monk's belt.