borjacapella,from my experince I think NYC has much more variations than EU, well to be honset it depends, for example when the bling bling came out US had more of the petwer colour than EU, EU had bronze and petwer...it really depends, but the NYC has much more colours, designs are the same though...as for price it also depends on the model...it could range from 585 US dollars ( such as simple pumps) to something within 1500 US dollars( python leather)....
And in Barcelona, there is only one store that carries louboutin and they dont have much variations...aghh i forgot the name of the store but it was facing la pederera...it has a multi brand stuff...pretty cool...