Mac Business Software

I am running a small business and we use a database system that was custom designed for us in the 1990's. I would like to make the move and transition the office over to a mac OS. I need to find a program that will allow me to keep track of contacts, process orders, create and save packing lists/invoices/etc., manage part numbers & inventory. All while recording the "bottom line." i.e. payroll, receivables, expenses, etc.

I have not been able to find anything remotely close. Does anyone know of a program like that?

Would this work? http://www.macupdate.com/studiometry