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Poseidon metal bodied Cyklons. High performance in all temps, dry breathing even upside down, super-low work of breathing, and, to top it all off, an undeniable cool factor.
Go with the 300's and you can be into the old boy cool!
Cheapest used Sh!t (prefer Dacor) I can find, then service it myself using homemade O-rings and lard, just to tell everyone on ScubaBoard how stupid they are for buying a reg from their LDS!