wondering what the recommended configuration is for a server with two 10G ports running ESXi 5.1
Actually, there is loads of useful documentation, lots on this site as it happens: https://connect.nimblestorage.com/content?filterID=all~objecttype~objecttype[document]&query=vmware
This is particularly interesting, if you are short on time: VMware vSphere on Nimble Best Practice Express Edition
I'd suggest also speaking to your local Nimble tech contacts, they'll be able to verify what you've done is correct.
Round robin multipathing policy, with networking set as per VMware's best practices. There is a guide somewhere on it, I'll try to find it for you.
Jason has given you good links.
And here are some point that may or may not apply to your environment.
Here are some links that may help you more..
You may also want to read what Wen Yu posted back in April 2013 TO LACP or NOT to LACP for VM and iSCSI traffic
In this guide he shows how to use LACP for VM traffic and over the same physical ports use MPIO for the iSCSI traffic
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