1--STi springs, lowers the ride ~1" and improves the feel (do a search, Peaty and others have done the swap).
2--17" rims w/lower profile tires (the Geolanders have considerable sidewall flex, a lower and more "sport" tire would flex less).
3--Sti or Cobb sway bars.
4--Strut tower braces (front and rear if really want to tame the ride and can lose the small amount of space for the brace in the back).
5--Tire pressure (35/34) though this won't fix everything, and it will make bumps more noticible, it will help a little.
PROBLEM: All BUT #4&5 will void the warranty.
I asked everyone at two different dealerships.
All of those mods count as "drivetrain modifications" and void your powertrain warranty.
Bumper-to-Bumper outside of drivetrain, and only if unaffected by your mods (ie no warranty for rubbing etc) is still covered.
So, for me, I'm waiting a bit for the above mods, but I do intend to do them once I'm not so worried about the warranty.