I have the x1700 and have tested all the new Pio mixers and Rane and A&H
My conclution is that I would not change my X1700 to any other mixer as the x1700 it is the
absolute best mixer I can find for me.
I also have tested the X1600 together with one SC2000 and it is a very good combination (even better with two SC2000s!
The reason why I love my X1700 is that Denon has put in the absolute best parts that money can buy in it.
That results in a soundquality above any other mixer on the market and a mixer that will last for decades!
Also you can preset a lot of things so that it works as you want it to wich is a very good thing, the preset can then be saved on a USB stick so if you have the mixer in a club every DJ can have his prefered settings on an USB stick……
The X1600 and X1700 has the same soundcard so the biggest two differences is that x1700 has 2x efx units and the x1600 has some more buttons for DVS
You will not be dissapointed with any of them!
If you have any questions about the X1700, X1600 or SC2000 I will gladly answer them here!