If you want to use the Mackie pres go out the inserts into the inputs of the dps16. If you havent got the mixer yet, get a soundcraft M-series for this. the pres are 100% better.
Soundcraft makes Soundcraft. I wouldn't say the Soundcraft pre's are 100% better than the Mackies but they are better. The M series have the same pre's that are in the Ghost, which is a damn fine mixer.