Tools
I own the Parker Rolo Flare - it does a pretty good job. The center slides to form the flare flange. The Ridgid 41162 model 377 is a pretty good tool. You may find for just over $100 by searching. The Ridgid tool has a rolling center cone to form the flare. Both make excellent flares. Similar skill needed for both.
The Parker makes a nice radius at the base of the flare, I don't know about the Ridgid.