Ok so I almost bought all the equipment and tools needed to do the plumbing.
I took a decision about the water supply pipes fittings, after a lot of reading I went with the clamps (not because they are better) but because the crimping tool is small and easy to crimp in tight spaces, low price also, (33$ for the tool and clamps included) And because the clamps are easy to remove and since this is my first time doing this I will probably make a lot of errors...
This is a test I did and I was impressed, by the strength of the clamp, you can see that I removed the clamp and you can see the marks left outside and inside the pipe. 



Also I'm not sure about a couple of things.
I can't seem to find the fittings to hook up the water tank, would this work? if I removed the compression nut? I need three of them.
http://www.homehardware.ca/en/rec/index.htm/Plomberie-et-%C3%A9lectricit%C3%A9/Plomberie/Aqueduc/Raccords/Laiton/Adaptateur-droit-en-laiton-plaqu%C3%A9-de-1-2-po-PEX-%C3%A0-ins%C3%A9rer-x-3-8-po-droit-%C3%A0-compression/_/N-2pqfZ67l/Ne-67n/Ntk-All_FR/R-I3298363?Ntt=1%2F2+3%2F8Can I use a crimped clamp on a barb end?
for example : the pump barb ends
Last question, I planned on using clear vinyl tubing (before the pump) with hose clamps and crimped clamps on barb ends, and white 1/2" pex (after the pump). I'm guessing where the pipes will be pressured by the city water inlet I absolutely need pex pipes and fittings.