The link below gives some idea of the CFM requirement's for various air tools. Make sure you read the NOTE right above the chart. It states something many people don't know, that being that tools are only rated on as 15 second run time. This means the CFM requirement really needs to be multiplied, up to four times, depending on how you plan to use it.
In other words, if a 3/4 drive impact takes 10 cfm, your going to need a compressor capable of at least twice that, a HUGE reserve tank, or both, otherwise your going to be waiting for the pressure to build back up between fasteners. If your doing something like the lugs nuts on a big tractor, you might as well plan on it taking awhile if you don't have that added capacity.
That gets annoying as heck after awhile, so getting a larger compressor, from the word go, is the only way to do it right.
Too, most tools are rated at 90 to 100 psi, but if you want to get any real work out of them, you need to run the pressure at least 120 psi, or higher. This usually means running a two stage compressor, unless you want the tools to be anemic as heck.
That said, as another poster suggested, the Honda GX390's driving a two stage compressor, and as big of a tank as they offer, ought to do just about anything you want to do with it.........short of getting into the rotary screw compressors that offer a constant output, without a reserve tank. It's not going to be cheap, whether you go new or used, but the extra money up front will save you plenty of heartache, and four letter words later.....
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