http://www.grainger.com/Grainger/items/5Z332
This is what I used. I didn't know about the surplus center back then or I would have used something from there. You only need a couple of feet to kill the vibration.
Went from the hose to 3/4 copper. Seems to be working great!
I went ahead and bit the bullet and got higher end unit. I have never regreted the purchase. It will keep up with die grinders, sandblasters, drills. It will get a little slow with two guys using DA's...