You could buy Clarion 6
http://www.softvelocity.com
It's brilliant and if you've got a commercial version of xHarbour they may give you a competitors upgrade price. Try e-mailing sales and asking.
It has native drivers for dBase iii, dBase iV, dBase V, FoxPro 2.6, Clipper, it's own TopSpeed format, ODBC, MS SQL, Oracle, + more
It also has an application generator wizard that handles alot of creating browse forms, input forms and basic reports for you. You just need to do a bit of fine tuning afterwards.
If you define relationships between tables referential integrity is automatically generated as part of your application even if you're using a dumb back-end like dBase.
The app generator will also use the relationships you have defined to create selection lists in the auto generated forms. It just saves so much work.
You can embed Clarion language code or c++ code and you end up with a compiled executable that you can distribute royalty free.
What more could a database programmer ask for?
Weave