You should look google for a GOOD dehumidifier for your basement.
I can offer our website link which of course is the best dehumidifier
out there because it's made just for basements.
http://www.basementsystems.com/dehumidifier/

We deal with basements everyday so i'd ask you to research about our
product called the Sanidry Dehumidifier.

Hopefully you will find a good solutions for your humidity problem