Did 5 screen-casts tonight, all I can say is the Blue Yeti + pop filter is fucking awesome. The settings on the Yeti allow you to change from what directions it picks up audio, so using the Cardioid setting it picks up mostly the audio from head on. It really helps reduce any unwanted noise.
With only a little tweaking in Camtasia (using volume leveling) the audio is pretty damn good.
This is defiantly the way to go if you want to do screen-casts, or pod-casts, or record dialog.
Awesome. Glad to hear it worked out for you. I need to go ahead and get a good setup like this myself, especially the pop filter.