Hey, I'm trying to pick out the air compressor for my shop and I don't know much about them. I've got my little Porter Cable pancake at home which is great for occasional use, but I don't know anything about industrial quality compressors. I know I want an electric and upright but that's about it. So can you help me out: How large of a tank should I get? What horsepower? Which brands do you recommend? Brands to avoid? Any other features I should go for or avoid? What's in your shop? Thanks!