Best GPU Rig for BitcoinIII?

Hello everyone,

I'd like to buy a GPU rig that can be shipped to Europe for mining BitcoinIII (BC3). BC3 uses SHA3-256t and is only feasibly mineable on a GPU at the moment.

Do you have any recommendations for online vendors that would sell such a rig?

Also, if a "GPU rig" is just a stack of GPUs with a central processor, does it not make more sense to build one oneself? Or would the expenditure be about the same in the end?

Thank you.