2 PrCs.
Shou Disciple from Unapproachable East. It's an FR PrC, granted, but the extend of the tweaking it requires to be droppable in any campaign is really just to remove the regional requirements. Shou Disciple is a good PrC in my oppinion - it lets you have a character that is very skilled in hand-to-hand combat, but without the ki, medatative insight, mystical abilities and eastern flavor of the monk class.
Reaping Mauler from Complete Warrior. The meat to the shou disciple's bread; both nice on their own, but so much better when put together. Reaping Mauler is a PrC focused on grappling. It does it, and it does it well and since wrasslin is universal it should fit right in as-is.
Also of note would be the Justicar PrC, again from Complete Warrior. The Justicar has good solid base of abilities that center around doing subdual damage, particularly with weapons. The down side being that it's very focused as to what type of character it thinks should have access to those abilities. Namely the lawful track-'em-down and take 'em in alive type bounty hunter, and it doesn't lend itself to well to being flexible in that regard.