get all carbon, and really expensive stuff. You'll be glad you did.
Now realistically, I started with Mavic krysium elite wheels. The 2010 ones are less than 1500 gr. and darn near bullet proof. Then I got several products from 3T. I like their stuff, it's light and well made. I started with a new 3T arcx stem, then ergonova bars (sized down to 40 instead of the 42 that came on my bike), then a 3T doric team seat post. That plus a new saddle made all the difference in the world to me in the fit and ride.
Next I went on a small weight weenie binge and bought some KCNC C6 brakes, seat post clamp, bar ends, KCNC skewers, and headset top cap. All in all several hundred dollars to save a little weight.
All of this stuff cost a bit over $1000 combined, but I lost a bunch of weight off the bike from the OEM specs, and I love the way it rides now, and that's what's most important.
here's a few pics of what it looks like now:
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