The best approach here is the teflon line (NSF Drinking water
certified) that is covered by a SS braiding to make it "high pressure", and then the SS braiding is covered by a silicone coating for chafe protection. Using swagelok compression fittings on the end of the line makes easy multiple on/off cycles possible without the fear of leaks
and the Stainess to Stainless seal of a Swagelok compression fitting is simply not goint to leak or suffer a cracked or lost
o-ring. They use these same fittings on high pressure fuel
lines (gas/liquid) for turbine engines, where a fuel
leak would blow the turbine and people up!
You can use this hose without the silicone chafe cover, but I wouldn't recommend it.
I would recommend the silicone chafe protection! It doesn't cost much more and it can save you form a disaser from a blown line due to chafe.
In terms of price
just to give you a feel, we sell a 1ft length of 3/8" hose with the compression nut end fittings attached for $105, then additional length is $10/ft. So a 5ft hose would cost $105 + 40 = $145.
I would go with 3/8", because 1/4" hose just has too much pressure drop, but we have tested a 30ft length of 3/8" Hp hose between the pump and Membranes with ZERO negative measurements.