HH3000 supports 4 x gigabit on the LAN side.
See this table halfway down that page for the specifications of CAT cables.
Personally I would go with cat 7, as those are shielded and are capable of doing 10 Gbps. It's not a bad idea to future proof your cables, and pending on your setup it will allow up to 10 Gbps LAN to LAN devices when using a proper 10 Gigabit switch.
Can also be used as a trunk cable to connect switches and if the switches have 10 Gbps uplink/downlink ports you can again do 10 Gbps between switches.
It's also backwards compatible, so you can mix and match and at the same time stay future proof.
You can also go with cat6a, as it also supports 10 Gbps but at shorter distances than cat7.
Just be aware cat 7 cables are not approved as a standard for telecommunications and although I never had an issue with mine, it's always possible they are not 100% compatible with your equipment.
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