I'd say put in an ODBC driver. It gets you support for a lot of databases right out the gate, especially if you keep things to a relatively simple subset. That

I'd say put in an ODBC driver. It gets you support for a lot of databases right out the gate, especially if you keep things to a relatively simple subset. That way, someone already running a postgresql or mysql database can plug things in and not need to track another place data is stored.