There's so much talk about various all in one solutions that I thought people should be aware that there are Portable Streaming Systems build with Wirecast as well. They use Matrox VS4 as 4 HD-SDI inputs complete with ISO recording.

DVStreamline MC2000
and their site which includes other all in one Wirecast Matrox VS4 systems.

1Beyond Wrangler and Wrangler Pro