I would look to the GTX. Many of todays apps are actually moving towards graphics that work better on the "gaming" brand anyway.

You would want the quadro or pro level card only if your application can use it. Like Michael pointed out, all (well, in a sense) the pro level card does is offer a driver that "unlocks" other aspects of the card. But with that said, it's nothing that you would use anyway, with an app that doesn't use it.

For instance, The card can be "profiled" to Catia or Microstation. That doesn't mean "save a settings". The card actually changes it's behavior and commanding per the app and it's functionality.