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The first drawing is the way i would plumb it with the exception I would use float switches and a solenoid to combat TDS creep. Let the staorage barrel draw down several inches before starting the RO so you dilute the initial high TDS water.
I use a 14G pressure tank on my system (drinking, ice maker and DI usage) and still see the effects of TDS creep. My RO produces a TDS of 5.3 to 6.2 once it is running for a bit but the initial TDS may be much higher. My pressure tank climbs to between 14 and 25 after about two weeks so I make it a point to completely drain the pressure tank at least that often by making 25 gallons of RO/DI water in a single day to allow the tank to fill with freash low TDS water.
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