I shopped around with 3 companies I recieved info about from local detailing businesses. Their policies
and premiums seemed to be for
MUCH larger outfits than mine and were pretty much standard.
I went with State Farm. I have all my personal insurance with them so maybe that helped with the pricing.

According to my agent (and my experience) the commercial policies they write can be customized to fit your situation. I am in a fixed location (part timer/weekender) with the shop and business seperate from my personal stuff.