I think both were good decisions. If you are buying your own tanks to this degree, I suspect you will soon be well past beginning scuba, in which case you will find a use for both steel and aluminum tanks. I have about a 50/50 split myself.
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I just found a Craigslist ad for a steel 72 for...$7.
Naw, I'm able to keep it...somewhat in check. But come on, who wouldn't jump on a good tank for $7?!