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4 1/2HP 21 Gallon Central Pneumatic - Harbor Freight.
I use my compressor mostly for removing lugnuts and other automotive tasks. The die grinder does tend to make it run alot, but otherwise the capacity is enough for my weekend tasks.
I usually only get hand tools from Harbor Freight due to the lack of quality in their non-hand tools, but this compressor has been great.
I paid $169 for it (typically 199), and just saw yesterday that they are selling it in their stores for $149.
This is probably similar quality to the auto stores.