If all you are looking for is for revision control and the ability to store and manage files then
the PDM workgroup would be the most reasonably priced. You would have to check with your VAR
on the pricing.
If you are looking to integrate a datamanagement program into it then you might want to look at EPDM,
but that comes with a heftier price tag.
PDMW is part of the SolidWorks family (professional & premium) and would be my choice.
Activault is probably the only other competitor to PDMW.
DBWorks is another alternative.
If all you want to do is rename them, you can do that in the PDMWorks Workgroup vault. If you have SolidWorks Pro or Prem then you've already got everything you need. Just get it installed, train up a few hours and you should be on your way.