Sorry if this question has been asked many times before but...

I'm a light rider (67kg but could be lighter) and i'm looking to build up some light, strong, tubular and relatively cheap road racing wheels. The only problem is what rims to use? I've narrowed it down to Ambrosio Crono or Nemisis rims; do I go for light and possibly flexy cronos or slightly heavier but bombproof Nemisis?

Any help would be much appreciated. Thanks  4