Tell me what to charge.....

A friend of mine (who's a local restaurant owner) and I have been kicking this idea around for a while. And since South Carolina is #3 in unemployment in the US, maybe this is the right time to do this.

What we have in mind is this: an online restaurant menu service. I know its been done 1000's of times but no one locally is doing this.

Our thoughts are to give a restaurant web presence, put their menu on the site, and offer coupons to people who visit the site. Thus giving the convenience of seeing the menu online, coupons for savings, and we will also add (if the client wants) the ability to order online.

So from your perspective: remembering that most restaurants here are suffering greatly because of our unemployment situation, how much would you charge per month?

I've got a figure in mind, but I want to see if I'm in the ballpark.

Thanks....
Pappy