What is your concern about noise? In that size of compressor I don't
believe there are any 'quiet' ones.
If this is a neighbor concern, I doubt if it will be that big of a deal. I
have a 6HP CH in my garage. When it starts while I am in the garage I am
occasionally startled. Outside, with the door down, I can barely hear it.
I can also hear it in the house but it is not disturbing. Beside that,
unless you are spraying, running air sanders or doing other things that
require constant flow, the compressor seldom runs for more than a minute or
so at a time. For normal use (nailing, occasional impact wrench use, some
other air tools, etc.) a larger tank will usually mean less startups.
As others say, oiled compressors are generally quieter. In addition to
being noiser, the oil-less machines run at a frequency that makes my hair