Primary tank question

[limeyx]

Start out with AL80's and go from there... they are commonly used enough that should you decide to change tank sizes and materials later you can resell them if you wish or for stage bottles or recreational dives should you choose to keep them.

I'd junk the AL crud and get a steel (85 is smaller than AL80 and has more air t 2640 psi and better buoyancy). From what I understand, the 120+ steels should probably be avoided to begin with for sure (and maybe even later depending on how tall you are)