So you want to buy a new air compressor? here is the information that you need.

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This is the best site I have found for information and straight explanations on what you need to ask yourself!
http://www.jennycompressor.com/howtochoose.html
All the usual disclaimer apply.

I will say that I'm thinking of hunting up a dealer and kicking the tires on one.
3hp 230v 1Ø 175 psi 80 gallon two stage Vertical 10.7 CFM  $2,294
5hp 230v 1Ø 175 psi 80 gallon two stage Vertical 15.2 CFM  $2,379
They are low rpm pump and motors. and with all the other stuff on them. It should have enough guts and glory for my needs in to the future!