GPUDirect and RDMA compatible PC configuration

I am planning to work in GPUDirect RDMA for Ethernet devices. My lab wants to buy a new GPU computer with support for GPUDirect RDMA. I know that it needs Kepler GPU, PCIE ethernet card, atleast 2 PCIE3 slots and both slots should be connected to same root complex.
Is there any computer available for buying with above configuration?

Which Kepler GPU is recommended for GPUDirect RDMA?
Which Ethernet card is recommended for GPUDirect RDMA?