Screw rotary compressor

What luck have y'all had with your screw rotary compressors. I need to get one our upright will not push another polisher. Don't have a lot of information on them just started looking yesterday. So some that range from 120 cfms to 524 cfms. I will be running a edge polisher, 3 water polishers, 1 grinder and (http://maplered.com) other items in future.
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Adam D. Siler
MIA, SFA
The Granite Concept Company
Admar Plumbing INC.
850-499-6589 cell