I'm sure that even two cheaper DS4:s would do, but the DST has TWO high pressure ports, to opposing directions, and the turret on DST rotates and makes it a bit easier to get the hoses neatly along the tank. DST is the better choise. DS4 is possible but different. And yes, the SPG hose can make an U-turn or go straight up/forward. A matter of taste...
---------- Post added July 12th, 2013 at 01:55 AM ----------
You can also run both regs from right as in that facebook picture, or from opposing sides (under the arm, over the shoulder or crossed over your back)(over the shoulder is a bit loose config though). It's a matter of taste.
I prefer a configuration where one reg comes from right, one from left and the hoses run under the arms. If I need a longhose, I run it from the right hand tank, over my chest, and around my neck, so it comes from right. Easy to match SPGs and regs that way.
---------- Post added July 12th, 2013 at 01:59 AM ----------
But hey, what's this "first regs" thing? Get good regs now and use them for twenty years. They are made of metal, you know, and service kits exist. Just choose a brand with continuity.