Again, you have a solid bike. Get a few hundred miles or even a 1000 miles on it and then think about upgrading. Or upgrade (I say change versus upgrade really) when things need to be done for proper bike fit. For example, if you are snapping spokes, get the wheel rebuilt with heavier duty spokes.

Just how I see it.

As for shedding grams, it is pointless when the best way is to shed weight on your body (I am in that boat). I would rather have a bike with parts that will hold me while I ride and shed pounds versus shedding grams off of bike parts.