[Canuck]

Use 1/2 inch copper pipe. It is easy to install yourself and the fittings are plentyfull for all applications. Place your water trap as close to your final outlet as possible. You will probably need more than one trap particularly near your painting outlet.Place your outlets so that the nearest one is no more than 8-10 feet away so that you want experience too much vulume drop through the hose>
Also allow for a valve at the bottom of the air tank for easy draining of air and water.
Go for a dual stage compressor with as much HP as you can afford. It will need 220 volts or 208 if it is multi phase power.Get a big tank or an extra tank because a blast cabinet really draws a lot of air. I haver a 9 HP Campbell hausfield commercial compressor in my shop with an 80 gallon tank and it is constantly running when I am using the blast cabinet