2 questions occured - tubing and fan related

[SpuTnicK]

Should I take Tygon R3400 or PrimoChill PrimoFlex Pro LRT tubing, will be taking 1/2 ID, 3/4 OD?
Pros and cons please from those that used this stuff. How long they last? How flexible they are etc.

I would go with PrimoFlex as they have better bending radius in tight spaces imho, have great variety of colors to choose from, and cheaper too. On the other hand, there is not reason to got with 1/2 ID, 3/4 OD. You won't feel much temperature difference compared to 5/8ID, 7/16OD, but the last is much easier to route inside PC case

Second one, well I need 2 140 mm fans for ventilating the future case, so which one would you recommend for those purposes?

Better read this first
Other than that, Yates are good for its price/performance ratio. But you can also use 120mm fans with corresponding adapters that will work as shrouds as well.