First of all whoever is telling that stuff is full of BS!! Carbon wheels require special brake pads which in turn won't allow you to stop as fast as you currently can which is why disk brakes became all the rage was to settle the issue with poor braking performance using CF wheels. And since you're only riding 100 miles a week you'll be throwing away good money you could use to something else with like pay off a credit card debt or some other debt.
Now if you think I'm a joke and it's time to read someone else's reply who will encourage you to spend money then at least don't spend a lot, you can get a really nice set of CF wheels from Flo for about $898 for the pair...that's what I said, for the pair, not each. See:
http://www.flocycling.com/store/index.php Go no larger than a 60 deep wheel otherwise the wind will make the bike handle poorly.
But personally I wouldn't buy any new wheels, the one you have are just fine for the limited amount of miles you do. If you were racing and putting in 7,000 or more miles a year than maybe it would be time to get a set of competitive racing wheels and continue to use the Fulcrum wheels for training on. Again this is just my opinion coming from a tightwad mindset.