I collect lighters a little bit.
I love my ST DuPont, but the main problem is they require Dupongaz refills. The fill valve is "keyed" so it's proprietary design, so no "inferior" butane can be used. The Dupongaz refills are $6.00 for ONE fill. And yes, the lighters are $600.
I have a Prometheus Churchill, which is the same design as the DuPont for $100. Works great, I really like it... but neither of these lighters are torches.
Both Prometheus and Colibri make good reliable torch lighters. I have many Colibris and have never had a problem except, when I used Colibri brand butane.
I also have a Z-Plus zippo (torch) insert, works great. Pull out the inside of the Zippo, and put this in it's place. Hold a good amount of fluid, is easily adjustable, and more suitable of being called a torch/tool than just a "lighter". What I mean is, it's strong jet flame is pretty serious business.
The main thing with a torch is to use good butane. I like Zippo Premium, and Vector.
Ronson and Colibri and anything without a brandname are to be avoided completely. If the butane isn't triple, or quadruple refined, it'll contain impurities which will clog the lighter in no time... and then it's toast.