If you were to go with DBpro, since you own it already.. I would suggest potentially looking into the LUA scripting plugin (I forgot what its called.)
Otherwise you might want to look into Python. Both LUA and Python are good candidates for a statistics program as they are really fast and Python in particular seems to be pretty popular in the science field (lots of complex heavy math). If this is for personal use, then you won't have to fuss with getting the scripts into an executable form, and just run the scripts via your local interpreter for either language.
If you only care about the data entry and not how pretty it looks, Python and LUA will do you well. But then again, if you know a dot.NET language pretty well, you can do the GUI through that and look into either Python or LUA embedding methods for your language of choice.
Python also has the benefit of using pySQLite (SQLite with Python bindings) so you get a pretty fast and robust database platform, embedded right into your application as well.