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How did you choose that router? The 600 series claims to be a little better.
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The XC-DPG602 is triple the price (almost $500) and there is only one real feature difference which I didn't need, since I am not running servers:
Authoritative DNS to IP:
The XC-DPG602 is an authoritative DNS to IP gateway that resolves a domain name to its respective IP addresses. This new capability allows for inbound failover and load balancing for servers located behind the gateway. Using dual WAN ports simultaneously increases available bandwidth for both uploads and download requests. You can set load balance type by Packets, Bytes RX+TX, Sessions, or IP Address.
http://www.xincom.com/twr_comparison.html