hey out there, i am in the market for my first set of single tanks, and maybe in a couple of years i could possibly use them in a doubles set but not riight now, not enough experience, or old enough for that matter. my lds carries xs scuba, oms, faber and i am not sure what else. i for sure want steel, and high pressure cylinders. any suggestions, i am willing to change my options to lp but not aluminum and different sizes. what do you use for your local diving i am for any suggestions