Imho, use a small mixer designed for the purposes of streaming/podcasting. This gives you the option of hooking up a condenser mic (phantom power) with a lot of extra features (should you want to announce anything for your show or about your mixes), plugging in the audio output from your controller and then recording/simulcasting your total mix (so including mic) into your PC.
My go-to mixer (it sits on my desk where it also doubles as my PC sound card) is the Yamaha AG03, because it has the long mic fader which I like. The AG06 is almost the same size but has more channels, but sacrifices the nice long fader for two mic channel gain knobs.
Read this pdf for some insight on how to set this up.
Just my three cents as usual.
Yamaha AG-series - The Why.pdf (373.3 KB)