To elaborate, what the head mod is doing is closing up the squish clearance and sqush angle to a more optimized range. In stock form, they are very conservative, but loose some in efficiency because of it. I haven't broken down and done this mod myself yet, but feel it is a worthy mod based on the present clearance and angle.
Other than that, Eddiet covered most of the standard items. Gripper cover, with grip on sides for my knees is very important to me personally. If you are tall, higher rise bars, or clamp spacers may be a worthy addition. Lots of folks complain about the chain guide, as is the same on your previus bike, although I must admit I haven't had any issues with it yet.
Rim locks are crap, replace with Motion Pro ones.