I currently have a site built in Coldfusion MX that uses an MS Access database backend. I generate around 6-9 thousand hits(queries) to the database (visitors) a day. There are also a little over 100 user accounts that insert and update data in the database on a daily basis.

I potentially might be gaining the contract that would expand the visitor and user account numbers by a factor of 10 or 11.

I want to be able to come up with a feasible solution if asked to give a presentation. I am mainly concerned on the MS Access front. Access works phenomenally well right now for the amount of users I have querying the site and for the amount of users i have updating or inserting data.

I still want to use Coldfusion MX, but am unable to really come up with a good database solution that would suit my needs. What do you think?