The guys that i use to work with that did this for a living, day in, and day out, used this=http://www.amazon.com/Panduit-GS2B-Controlled-Tension-Cut-Off/dp/B001EU2558?tag=ihco-20. Not cheap, but if your going to be making your living with it good quality tools cost money. Also remember if you need this for your job, you can right off it's cost on your taxes next year.