I'd go with the FX based on your description... But you should definitely ride the Neko before you make up your mind. Neko is about halfway between your 7100 and an FX, and might be just what you're looking for if the FX didn't feel right.

If you want a lighter bike, the 7.5 with carbon fork would be the way to go, especially the non-disc version. Otherwise, if you can live with V-brakes, the non-disk 7.3... and plenty leftover for accessories. 7.5 would be a sleek, quick commuter; or deck out a 7.3.

Do try the Neko, though.