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I would just go ahead with the exchange thing usning C25, an argon-co2 mixture. I initially wanted "my own" bottlealso, but the gas places that I have seen aren't set up to well for giving you back your own bottle. I think that it takes some time to actually fill up the bottles, so it's not really a "while you wait" kind of thing. Although you just got your welder, and I am sure you want to keep it nice and shiny, the gas bottles are just a commodity thing, and it's easier just to drop into the gas store, swap bottles and go.
I would get the bigest bottles you can get. I think mine are 80cf.
One more thing, you really want to shop around at several places before you buy. I've seen big prices between different distributors. I think that some of the places only want to deal with big corporations, whild others give the little guy a decent price.
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