Reply to Numark Mixtrack (Pro)

I'm planning to buy some of the Mixtrack controllers, as I could read the PRO has built in soundcard. I have an external sound card (not professional one) http://www.sweex.com/en/assortiment/...d-cards/SC016/
So please if anyone has a good knowledge to tell me what to buy, the usual Mixtrack or the Pro one.

Thanks, :-)