http://www.clubhotrod.com/forums/showthread.php?t=25020
This is the thread I started about notching tubing. I use a cheapo H/F unit I got off eBay for less then 30 bucks shipped. I have no issues with it.
Check out the thread and you will see I get beautiful notches with it and I can do them extremely fast once the jig is set up...
Mark