Microsoft Access equivalent DB for Mac?

Hi all. I was wondering if anyone knows of a medium size database application for the Mac that is similiar to the Mac.

My wife is starting a consulting business and has asked me to help with the invoicing and receivables. I know that there are packages out there to do that already but I was thinking about building my own for a start. The problem is that she does not want her immidiate manager to know her rate but said manager has to sign off on the hours worked. I dont want to have to create a special invoice all the time like I did for the first one.

I have two questions really:
1. is there an Access equivalent for the Mac. If I had this I could build the resume from scratch exactly as I need it then just run it once a month.

or

2. Is there a inexpensive business application that has many different types of invoices with one that will show hours and not calculate the rate? I am doing a trial of Billings but it does not seem to do what I need though it is quite easy to use.

Thanks all. You all rock harder than Pantera

I can try the trial and I did search the forums before I posted. I am not sure about the ability to create forms easily and if everything is self contained like Access. That is what I really need to be able to do. I generally hate Access but for what I need, it excels. Though I could, I don't want to make something with MySQL because I dont have the time to invest. Also, I am not sure about the price but I might be able to do that.