I agree with smartecosse, there is NO difference between tanks used on the surface as opposed to diving except for how often you have to have it tested, maybe i should have been a bit clearer.
The reason we write "LAND USE ONLY" on ours is so we don't get the third degree about having etsted etc.. everytime we go to fill it up.
The 232 sounds like a bargain but remember that generally you'll only be getting 2000 psi (and a bit over) fills out of it.....if you can hang on a bit longer or spare the extra cash i would be inclined to wait and get a 300 bar...