Reply to USB Sound Card

I'm up and starting. I got a Numark Mixtrack and a Numark DJ2GO. I'm looking for a cheap soundcard that will let me cue my tracks and have a main output.

I'm looking at the Behringer UCA222 and the ikey iconnex.

Would those cards have a quality sound and not have a problem with latency?

Anybody use them with success?

Thanks for your help..