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there are many manufacturers
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Go look on the Samtec site. They make the Altera HSMC connectors, the Xilinx FMC connectors, and Mictor connectors. These parts are all used for transceivers, so would easily transport 600Mbps.
I've used VHDCI/SCSI cables and connectors for 250Mbps, but probably wouldn't use them for much higher than that.
The other option is to use the PCB as a connector, eg., PCIe, mini-PCIe, etc, use the PCB as an edge connector. Depending on your mechanical arrangement, that might work too.
Cheers,
Dave