I believe all Vixias have clean HDMI out. In some cases you can find them at around $250 but often under $300 for base models.
Blackmagic intensity Pro cards, which accept HDMI in.
I find that B&H Photo Video tends to have the lowest prices and best variety.
You can use Telestream Wirecast as a software switcher, compositor, encoder. It also has Video Display Output for local hardware integration.