I need a Database Recommendation

I am involved in the startup of a new business and they are going to require a database for accounts receiveable, customer information, salesman tracking and commissions for a start. Since it is a small business at this point, we probably need access on no more than 5 computers. I am familiar with Access which I hate and filemaker have a copy of filemaker. Is there a recommendation out there as to what would be the best and easiest to build and use?

I appreciate any imput I can get. Thanks