What you need is at least a 60 - 80 gallon, 2 stage compressor that will handle continuous service. A 2 stage will run much quieter and will have a higher storage pressure at a lower temperature, a single stage will also work in your situation as the demand is not as high as in an industrial setting. Also, most consumer/contractor grade compressors are only rated for 25% service, this means only being used 15 seconds out of every minute they are actually being used. A continuous service compressor is built for just that, continuous service/use. An industrial grade compressor will run a bit more but will probably never need to be replaced. Here are a couple of ideas for you.
Northern Tool
http://www.northerntool.com/webapp/w...w?storeId=6970
Lowes
Product Compare
Home Depot
Product Comparison Page
Hope this helps some, Bob K.
