eurus vs zipp 303

i know there is a $500 difference between zipp 303 and the eurus. but, is the performance difference worth that much? I was ready to have a set of 303's, white industries hubs built, but after waiting for parts for 3 weeks, i am reconsidering the whole thing. weight wise the eurus and the custom set will be within 100 grams of each other. is the custom set going to be that much better? i will appreciate any feedback, since i have to make a decision by tomorrow pm.