Go to 5.5. There are better solutions, and with vSphere Replication, you can actually truly have a DR site. it's hard to have a DR solution when both vCenters are different major releases. I would recommend 5.5 on both sides. Unless you need a specific physical box for VC, just deploy the appliance. It's easier, less hassle, and easier to manipulate. Or use VC as a VM. 5.5 has more options, supports more features, and is stable. It also uses SSO 2.0. SSo 1.x was more hassle then it's worth. Well, now that I think about it, that should be the driving factor for you: SSO 2.0. trust me, it's easier and less buggy.
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