What did the original poster decide to do? I'm in the same situation. I have 2 upcoming gigs for fewer than 15 people- 8 adults and the rest kids. One is a shore dinner- lobster, steamers, mussels, all the fixings; and the other is a bbq with steak and paella. The events are an hour from my shop at an estate on NH's biggest and most expensive lake. Money is not a problem for my clients. Obviously, I'm charging travel time and mileage-90 miles round trip. I am bringing a helper with me, so we'll both need to be paid. Already, that brings the cost of the party up there without even taking food into consideration.
The pricing keeps me up at night.

I don't want to look like I'm gouging them, and yet I don't want to seem cheap
And what's more is that I've only ever done paella once before.

I need to impress these people as I've been hired by a real estate company who handles high end rentals and this could mean lots more business for me- both summer and winter.
Now the paella will keep me up at night. Will post questions relative to that in the recipe section.