Just remember that your piping is going to develop calcium carbonate scale over time. That roughens the surface and increases friction, as well as decreases the tubing diameter so your flow will actually decrease with time. That's another reason I like Tygon over PVC. I can just pinch the tubing with my fingers and the scale comes off and I can catch it in a fish net. Its hard to squeeze PVC with your fingers. Besides, if you ever want to re-do your plumbing, or clean it, or move the tank, its just a matter of undoing a few hose clamps as opposed to cutting up PVC with a hack saw.

I moved my tanks 3 times in 14 months. Believe me, been there, done that.