Reply to Best DJ mixer with USB Soundcard?

I'm looking to upgrade my DJM400 to a 3+ channel mixer. I just use it along with an X1 and traktor but I've been wanting to get a remix deck or ableton channel going.

Anyways I just wondered if anyone had any USB mixer recommendations?

That NOX303 looks alright, pretty no-nonsense mixer - but I can't find the soundcard specs for it which is worrying, and no channel filters and the effects look pretty weak. On the other end of the spectrum is the DJM750 or the XONE DB2 - that's kind of my limit in terms of price - but again, dedicated channel filters...

Thoughts??