If running a air line equipped shop this is one instance that spend the extra money will save you money in the long run. PVC/ CPVC is a bomb waiting to go off, those that want to take the chance I'm not bashing you, but it's shrapnel, shards, needles when it explodes, and you can bet the quality of PVC has went down over the years as well.
Aluminum, or copper would be the best choice, as mentioned it is expensive, but once finished it's set for life. It's also not hard to change around if you would like to add, reroute etc, and unlike PVC it does not become brittle. Black iron rust horrible, and loads up tools, not only that it comes from the factory with gunk in the inside.
I'm facing the same exact upgrade as you, and I'm looking at aluminum with some drop rubber (they have some kind of high quality rubber that withstands extremely hot water) for small work stations etc. And table work stations will have a drop aluminum pipe right to it with quick connect.. and the option for the rubber lines. I have a fine air compressor ( ingersoll rand) and I'm ashamed to admit that I have rubber line run as of now.
On edit PEX is the word i was looking for, again it's not the best or near best for the main runners, but real handy for small work stations etc)
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