into a mixer that is going to have a better re-sale value if you want to upgrade down the road. plus you will be getting a Serato ready mixer that gives you the option of using SSL as a backup program.
keep in mind that you might want to use the sample decks as an extra option. So check if your 2channel mixer has an extra channel to rout the sample decks.
I myself am fooling around with a denon x600 for the following reasons:
Midi assignable knobs and buttons
build in soundcard so i can rout all (sample)decks just the way I want to
when friends come over they can plugin their stuff without mine being affected (different channels)
the freedom of internal or external mixer
Plus I really like the feel of the knobs and crossfader. I’m not a scratcher, but the crossfader feels really smooth and the rubberized knobs feel a bit sturdy.
I’m using the traktor effects, but the effect unit itself is actually quite nice too and easy midisynced with traktor.