IMO, $150 sounds great if you can get it. You stated that they sit 30-40 people. In my experience, that is a fairly small dining room. A few questions come to mind:
Is there a history of them having paid entertainment ?
What kind of place is it? Upscale? Family?
What is your opportunity cost? Do you usually work on Sundays, for better wages?
My point being...without knowing some of the details, the "correct price" could differ.
A word of caution...and I know some will disagree with this...make sure you're not asking for something the owner/mgt. can't/won't pay. Too many times I've seen in my area of Dayton, OH places stop having live music altogether because they paid top dollar for a period of time...lost money...and then stopped having live music altogether. One less place to work isn't good for business...
If you're not working on Sundays and looking to be seen and make reasonable wages...I'd suggest you be flexible. If this was Fri/Sat and you're already making good money somewhere else, then its a different story. Don't forget, people will hear your talents and from that, other possible bookings can often pop up.
My goal in situations like this is to be paid as well as possible for my performance but not so much that I cut my own throat in the long-term anywhere. Also, food/bev can be part of your compensation as well as cash.
Hope it helps-
Bill
[This message has been edited by Bill in Dayton (edited 09-03-2004).]
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Bill in Dayton