the most commonly used types of tygon used are R3603 and R1000, the latter being softer and more expensive. There is also clearflex, masterkleer and regular vinyl/nylon tubing. R1000 is reported to collapse with really high pressure pump intakes.
i dont think tygon is necessary b/c you are planning a 3/8th ID system. The extra flexibility is probably not needed (unless you have a small/restrictive case) and its more expensive as well (which may or may not matter to you).
Hope this helps.
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