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Good advice with the craigslist suggestion
What kind of stinks (this is ignoring your patience suggestion ), is that I want to dive the day I get down to florida, and probably won't have the oppurtunity to wait for a tank to be hydro'd and whatever else it needs.
Maybe ill buy one new (to hold me over), and then scour craigslist as much as possible
it seems that the more tanks you own, the more you'd have to dive for it to be worth it. So instead of my theoretical 48 dives for the ONE tank to pay for itself (yearly), it'd have to be 96 dives for TWO tanks to pay for themselves (this is in the first year)
Now that i'm thinking about it, that might not be that hard to achieve
OK an important question. Do you have plans to dive local or more frequently? If you are talking just one dive trip south each year - rent the tanks. IF you are diving local too or planning multiple trips where you will be driving and diving - tanks make more sense. However, I would look at the worthington steel 100s (or 120s if needed) and think nitrox too to get the biggest bang for your buck.
To a scuba diver, buying a first tank is a slippery slope. It's like the little old lady who starts off with one cat and gets another to keep it company. Pretty soon she's got a house full of cats, and she's known in the neighborhood as the "cat lady."