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As a home owner with plastic piping I can do my own plumbling work if I had copper pipes I would need to call a plumber in order to do what is simple mantainence with plastic

What is so damned difficult about plumbing with copper? If you personally can handle working with plastic pipes, you have 90% of the skills you need to work with copper. Try it sometime, you will find this is true.

Exactly. I use PVC outdoors for plumbing, but would absolutely never allow it inside walls. Copper is much, much more reliable, especially on hot water lines. It can also be grounded, which PVC cannot. Even with GFI circuit breakers, the additional safety of grounded plumbing is valuable. So it costs $500 more to plumb a house with copper. So what? Plastic is for sewage and drainage, in my expert opinion. For water under pressure, copper wins every time. As for repairs. I can solder up a leaky pipe with a coupling just as fast as I can do the same job for plastic. If you get to specify...specify copper for all in-wall plumbing. For external plumbing, plastic's OK.