Reply to Any Denon DN-X1600 mixer users...Need input before buying....

I am potentially buying a Denon DN-x1600 mixer for use at home to replace my functional, but largely useless Numark M6 mixer. I mainly use Traktor with an X1, a Xone:K2 as my internal mixer controller etc., and now the new F1. I recently have branched out to add 2 CDJs for practice at home to give me extra versatility. After a lot of research it looks to me like the dn-x1600 meets most of what I want:

• 4 Channels
• Built-in 4 Stereo In/Out USB Sound Card
• FX Send/Return
• Full-Kill Isolator EQs
• Matrix Input
• MIDI Mappable
• Built-in digital FX
• Sub $1,000 price-tag

What's missing for me: dedicated Filter is the major issue. A 2nd FX engine would be nice...but sends the price through the roof. The DN-x1700 is just a bit beyond my reach as are the Pioneer mixers, and the Xone: DB2 and DB4 are just ridiculous $$$.

I briefly considered picking up a used Xone:42 and a Pioneer RMX-1000, but the built-in soundcard and MIDI mappable surface of the DN-x1600 just seems to provide more flexibility. I want to use this for both Traktor and CDJs, so I want maximum flexibility for minimum $$$...I still may want to pick up an RMX-1000

So my question is this: any DN-x1600 users out there, how do you like it? worth the investment? any regrets?
Also, any other mixer recommendations?

Or...talk me down from the ledge and tell me to spend my money on something else...