Reply to 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.