Personally if the money if not the problem I always prefer fiber for the moment.
I don't know if you connect the cable direct from one rack to other or use any cable mirror. If you connect direct you can use cobber but I still prefering fiber.
Take a look in this Cisco info:
Several media and transceiver options are available today for 10 Gigabit Ethernet server connectivity. Considerations for use cases depend on variables such as cost, latency, distance, power consumption, and technology availability. Cisco provides two main 10 Gb Ethernet copper server connectivity options today:
SFP+ CU copper
RJ45 10GBASE-T copper
Cat6, Cat6A, Cat7
Category 6A (Cat6a) copper cabling was developed in conjunction with the 10GBASE-T standard to achieve reliable 10-Gbps operation over 100-meter copper twisted-pair channels. 10GBASE-T has higher latency and consumes more power than other 10 Gb Ethernet physical layers. However, in 2008 10GBASE-T silicon became available from several manufacturers with claimed power dissipation of 6W and a latency approaching 1 microsecond.
10GBASE-CX-1 based direct attach cooper is an alternative copper solution that uses SFP+ direct-attach Twinax cabling. Although this solution has a limited cable distance of up to 10 meters, it provides a robust, power-efficient, and cost-effective solution for 10 Gb Ethernet transmission.
The SFP+ direct-attach solution is a fully integrated SFP+ cable that is available in multiple lengths up to 10 meters. The SFP+ direct-attach solution draws 1.5 watts (W) of power per port, has a latency of 0.1 microsecond, and is available today.
Regardless of these variances, Cisco offers a full range of standards-compliant, high performance copper-based 10G solutions.
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(Pdf copy at the bottom)
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