You made a great choice. While I went with the C10 I've heard nothing but
praise for the 9.25. If I had a chance to make the choice over I would have
gone with the 9.25 myself.
Don't bother with the GPS attachment for the CG5 mount. The go to system
only uses the latitude and longitude info, nothing else. About the only
item you might want to look into is a Polar alignment finder for the mount,
the one sold by Orion works better than Celestrons.
Enjoy! the 9.25 is a great scope.
Clay