I've been known to attach one of my headlamps to my wrist (princeton-tec, enegeizer,etc.) by adjusting and doubling-over the headband. By using a standard headlamp, I get the benefits of being able to adjust the angel of the beam, using standard batteries, and the ability to put it on my head if needed...not to mention, I'd imagine that any of my headlamps cost less than anything made by Surefire.
....But on second thought, if you've really got to have something that 'looks' professional for your job, you might want to go with the Surefire.
EDIT: Surefire 2211 = 200 lumens, Princeton-Tec Eos = 80 lumens.
Yeah, I'm starting to see the advantage of the 2211.