Even your basic Imperial brand double flare kit with the little buttons will do the job, try to avoid the really cheap imported flare kits.
I've used the Easwood lever type flare kit and also a similar one form Fed hill, and one from Brakequip.
The Eastwood one is lower quality, the dies and blocks are not finished as nicely, it's still a functional tool.
Fed Hill was expensive, very functional.
http://store.fedhillusa.com/flaringtools.aspxBrakequip a good balance of price, quality, and also very functional, this is the one I have/keep and use regularly.
http://brakequip.com/products/tools/flaring-tools/
