I would stick with 1/2 for the sake of your pump (like pH said).
DO NOT run all 1/2 ID except around your res !!
Also do not overlook the option of using a T-line. (you didnt list it)
You will find many members here to be very supportive of a T-line actually.
Considering all your components except your res are equipped, or are available with 1/2 OD barbs, just stick to 1/2 ID tubing.
hopes this helps you choose....
SenC.
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