Compressed Air Piping

I checked Home Depot price-wise and for a 10' stick of 1/2" dia, copper was $3 cheaper than galvanized and $1 cheaper than black iron. Surprising. I think I need about 50'-60' total. It's about a 20' run to the front of the garage and then 10' over to the hose reel between the doors. probably come back towards the front and have a flex drop in the middle of the room. I like the idea of the blue stuff but it isn't available close by and I hate ordering stuff in like that. Copper is easy and I don't mind soldering so I think steel pipe is out for me. Need to think on the blue pipe some more and see where I can get it. I can rarely get the design right the first time so access to the parts is important.