I'm not a big fan of those green lines from the parts houses as they seem a bit brittle to me.
For years I used the standard issue Snap On tube flare tool that I bought in the early 70's off the tool truck but I bought the Eastwood tool on sale last year
http://www.eastwood.com/professional...14caAkJw8P8HAQ and love it. The only issue with it is that you really need a vise close at hand to use it with and you have to take the line to it rather than flare the line on the rig.
I've always bought lengths of tubing at the parts house and then cut and flared the pieces I needed to have fit in a specific spot to get just the right length but have been looking pretty seriously at buying the tubing by the roll and getting a tube straightener from Eastwood as I have a number of brake line jobs to do in the next couple of years.