Jason,
I will not recommend hiring or paying a firm to do Market research for you. There is no information they will come with that you do not know already. The information is all out there. Join NBAA, do the digging yourself. You can find just about any information you want on Operating costs of any kind or type of business aircraft out there. AOPA is another source. Talk to a lot of folks who already have such operations. There is never a market saturation.
Propeller Investments is a company that has some knowledgeable guys. Check them out as well.

Thanks,
A