It depends on which version of Windows you have. If you have 64 bit, the Coyote wave table is your only choice. Sound quality is not great but it will allow you to use BIAB. XP or Vista will work with any of those you mentioned. Stick with the Roland VST/DXi for best sound. PG also sells Coyote Forte which sounds better (to me) than any of those.

I'm not sure what problem you are having. In your Midi setup screen, be sure to check the 'Use VST/DXi synth' box. Another screen will open up allowing you to choose your synth.

R