Jon,
A few years back I bought a Mastercool hydraulic flaring kit. It does double flares, sigle flares, metric bubble flares, GM fuel line flares, and push lock flares. The only thing it doesn't do is 37 degree AN or JIC flares. You need an extra set of dies for these (which I bought at the same time). It wasn't cheap, but after years of fighting with cheap flaring tools and sometimes not having the right tool when needed, I decided to spring for it. I am happy with it, the only downside, it is big. Sometimes when you want to make a flare in a tight space you can't do it without removing the line. It is also heavy and sometimes three hands helps when making a flare in place. If I get a chance I will try to look up where I bought it. I am sure it was an ebay vendor, but also sure that he was about a $100 below what others wanted at the time. Was worried, but it showed up in a few days in all new packaging.
Bill