I'm not much into upgrading except for comfort or safety - my two items - saddle and oddly enough, seatpost. The stock seatpost on the 7500FX has a saddle rail clamp mechanism that has a tilt adjustment that uses discrete "notches" for locking - turned out to be a tad to high in front, or a tad too low in front in adjacent notches. Also a bit tricky to adjust, keep fore/aft position right, and tighten.
Upgraded to a seatpost with a continuous friction tilt adjustment (Bontrager) with a adjustment for tilt and fore/aft position from the side, not the bottom. Tilt is just right every time and can be adjusted without removing small under saddle bag that I use for a tube and CO2 kit.