Arbaz .... You don't say where you are from, but in Rhode Island I would say $150 for a steady, weekly gig is about right...
I imagine you know what kind of clientele you will be playing for ...
I don't know the volume capacity of the 3000, but the problem I've seen in some small rooms is that I like to play through amplification because I think the sound is fuller, richer, even with low volume ... BUT even if the patrons are ok with the volume, sometimes the wait staff will say that they can't hear the customers because 'the music is too loud' ... especially if they've been working at the restaurant without music in the past...
Best of luck ...
t.