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iSCSI and dissimilar nics, 1gig and 10gig. MPIO or MCS? Weighted paths or Failover only?

We have a Windows 2008 R2 SP1 Data Center server set up in a 2 node Cluster Shared Volume environment.
It is setup with iSCSI connectivity to our NAS. The server has 2 nics dedicated to iSCSI and are both 1gig nics. One nic is for data, the other nic is for the Witness Disk (quorum) connection.
We are using MCS not MPIO.
iSCSI initiator is setup with Round Robin.
This has been working fine for over a year.
We are changing our connectivity.
The legacy 1gig nic for data will be disabled, and we will only use the 10gig nic for data connectivity to iSCSI.
We will leave our 1gig Witness disk (quorum) on it's current legacy iSCSI connection.
Should we continue to use MCS and change th iSCSI connectivity from Round Robin to Weighted Paths?
Is Fail Over Only an option?? (I need 2 connections, iSCSI data an iSCSI quorum)?
Should we change our connectivity to MPIO and not use MCS?
Is it a bad idea to have our iSCSI data on 10gig and our quorum connection on 1gig?
Windows Server 2008Active DirectoryVirtualization

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David Johnson, CD
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We purchased it from Dell and is in a slot.
Windows Server 2008
Windows Server 2008

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.

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