I know you really want flex hoses, but I colour coded mine with the over braid (I think it was from beaver sport).
So I have green for O2, red for dill trimix & two other colours for high and low bail outs.
Its a much cheaper option than all new hoses and if you change you hoses every 5 Yeats or so can just slip it off and onto you new hose.
Update: I've been dealing with lots of people while retooling my pneumatics, getting ready for a trip and looking for the mythical green braided HP hoses. The very most helpful have been Danny at Good Life Divers, who has many connections and great knowledge of whats on the market, and Randy at Piranha Dive Manufacturing. Randy's prices are great and he is going to put in an order for green HP hoses soon so get in touch with him if you want some. Both operations have great customer service as well. Thanks again to all who gave input... -Andy