Neowin takes a look at the Synology's 5-bay DS1522+ NAS with 10 GbE card
A quote from the article:
If you're looking to get a home NAS server or want to upgrade what you currently have, take a look at the Synology DS1522+ which has great performance and can be upgraded to support 10 Gbps speeds.Synology's 5-bay DS1522+ NAS with 10 GbE card Review