Knowing what type of torch you have and what kind of work you do (i.e. small soft glass beads or huge boro marbles) will definitely weigh in on what kind of advice you are given.
A concentrator is perfect for a small torch (Minor, Cricket, etc.). As you get to larger torches (or trying to get a huge flame out of your small torch), you'll find that the "standard" 5 LPM oxycon just can't keep up. Lots of folks will buy a higher-output (read: expensive) oxycon, or get a second standard one and a "Y" connector to use two together.
Tanked oxygen can keep up with just about any torch. However, you will find that it runs out pretty quickly. A standard K-size tank will only last a day or two for a lot of people. At $30 for a fill (+/- depending on where you live), this gets pretty expensive quickly. A couple of months of this and you may find yourself wishing you bought an oxycon or chose a cheaper hobby.
My advice is to keep watching Craigslist for a cheap used concentrator. I hate to say it, but old people occasionally die, and the people they leave behind just want to get rid of the stuff they'll never use. That's how I got mine. If you find a good deal, you can buy it and try it out. If you can't find a good deal, you can always rent a tank from your local welding supply shop.
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Joe
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