Good choices. The IS is
Good choices. The IS is available in convertible too. :) The RDX is assembled in Ohio, mostly from parts sourced here. The Lexus isn't the only one on your list that's an import, btw.
The Accord Plug-in is built in Japan and imported and is currently only being sold in California and New York. The regular Accords are made here, but not the plug-in.