I wouldn't worry too much about weight, it's mainly the tyres and tube that make the biggest difference, the cheap Fulcrum are generally reliable and give you some left over for some nice tyres and tube.
Other option is the Ksyrium Elite Disc if you really want to keep a reasonable weight.
I had a look at the Fulcrum wheels, but they're either the low end ones, or £800+
Currently, I've found Zipp 30's with Campy free hub for £600 which seems a good middle ground.