Valerie, I use that combination for our local town meetings and it all works nicely. XPression is a bit steep to learn strictly for live CG, especially for talking heads, but it's a big beefy 3D animation package so you'll have a tool to do some jazzy stuff. I'm also using the PC for a bit more than running XPression, so if you can justify it it's money well spent. As for the Solo, it's a powerful little beast that allows a lot of flexibility for live government access. With three keyers I can have a live bug but send my encoder a clean feed without it and still slate the meeting and any or all guests and have that be encoded for on-demand and the live stream.
HTH,
Geoff.
#XPression