I am trying to install a Sirius Sportster in my Town and Country but want to wire the power direct to the switched/accessory circuit. Anyone have any ideas where to do this best? In the fuse box? Or find a switched wire somewhere and patch in?

Go here this will give you the wiring diagrams.
Need adobe acrobate reader to look at it.
http://www.installdr.com/QuickWiring.html