Wrongnoterod
...Point of all this... I dont record with the machine I am needing a new audio interface/soundcard, only playback and mix.
Does this change any opinions?
Yes, if you need an interface to mix only, then a basic USB unit like the Focusrite 2i2 or Steinberg UR12 for monitoring would be enough. (Personally I would get the UR12 as it's $50 less than the 2i2, plus IMO the drivers are more stable, but bottom line, it's subjective, and they're both good budget units).
First, how are you handling the mixing now with only a soundblaster card? Do you have adapter cables or a mixer feeding into monitors/ headphones?