recommendations for external sound card for Traktor
I have been using the Korg NanoKontrol for about a year with VDJ. I have recently purchased a VCI-100 along with the Traktor Pro. I was told that I need a new sound card (I have a Behringer UCA222), which only has two in/outputs, I believe I need one that has 4x4 I/O. I’m looking at a budget of under $200, any one who knows more about this than I (which is obviously very little), your advice would be greatly appreciated.
i got an native instruments audio4 and was amazed at the low latency and sound quality, get one dude! 
what do you need the two inputs for???
if you’re just mixing internally (any amount of channels within a program) then all you need is something with one Main channel..
I would then recommend the Native Instruments Audio2 DJ, which has the same quality as the Audio8 but with no inputs
Check this out OP.
Dude from Native Instruments tech support told me that I need one that has 4 i/o to be able to monitor while I have music playing out. He was really rude and scoffed at any question I had. He said to get a 4 i/o and call back to configure it.
You can monitor fine with an Audio 2 DJ sound card. It has two outs. A and B. I have configured mine to use A as master out and B as head phone monitor.
If your not planning on ever hooking up turntables or CDJ’s an Audio 2 will do fine.