If you're LUCKY enough to be playing Pathfinder, Paizo saw it fit to fix the whole "Monk can't enchant his fists" problem.
Look at the Brass Knuckles at the top of the page under "Unarmed" weapons. The See Text part is particularly important. If you're in a 3.5 game, I don't see why you couldn't at least ask your DM if you can get a pair of these since Pathfinder and 3.5 are conversion compatible.
It's an easy fix to a long standing problem for Monks and it solves all those "I can get past this DR" BS problems, along with the "can't enchant my fists" issues.