The best flint lighters are by far Du Pont. I have 5 of them and every one has worked perfectly for years. You do not have to use their expensive rip off refills. I have used Blazer fuel in them all for years. You just have to find the right attachment for it. Other good flint lighters are Davidoff and the Corona Old boy.For the price the Old Boy is the best value in a flint lighter. I also have a Dunhill which is also a quality flint lighter.
For non flint lazer type lighters the best on the market is the Blazer pb207 as bfreebern recommeded. It has a long history of working and never breaking. The tank on it holds enough fluid for weeks at a time. The Prince knockoffs that are being sold are garbage, stay away from them.
Colibris and Prometheus are garbage,they always break and only if you get real lucky do you get one that will last a few years. I have a Colibri that has the three flames and it is the only one that is still working.
The Dupont Extend is made by Colibri so they have a similar track record but they have shown to be a little better than the standard Colibri. I have 2 of these, one is still working but I rarely take it out because the tank on it is so small, you never know when you will run out of fluid.
I have a good source for the Blazer PB207 if anyone is looking for it( I have no affliiation with the store just a satisfied customer). The new ones come with a child safety feature that can be a bit difficult to first figure out, but once you do the lighter is superb.
I would also stay away from anything made by Xikar, there history of making a product that needs to be sent back on a regular basis is well documented.