Best design for 1GB NFS

I have 4 1GB uplinks available from my ESXi 5.1 host to use for NFS.  On the array side, I'm using only 1 IP for NFS.  There is a 10Gb Etherchannel link between the array and the physical switches.  However, on the links between the ESXi hosts and the physical switches no Etherchannel or LACP can be used.

Enterprise plus / load based teaming is available.

On the ESXi host:

How many vmkernel ports should I use?

Which failover policy should I use (active / active)?

Which load balancing policy should I use?

Thanks