Large File Server options

I need to host about 10TB of contiguous Windows File Server space.   We all know about the 2TB VMDK limitation.    So I guess I have several options:

1. Make several 2TB  VMDKs and use Windows software RAID to span them together.   Probably works OK, but sounds scary.
   
2. Use a Physical RDM (64TB limit according to docs).  This would be my first RDM, but it sounds like I'd just have to rely on SAN based tools instead of VM for disk management. Not sure what the cons are really
   
3. License NAS service from our SAN (FC attached Netapp 3220).    Would work, but additional expense and learning curve
   
4. Skip VM and host this on a Physical box attached to the SAN.  Added expense and more hardware to babysit. 
   

So I guess I'd like to know what the typical solution is.  I know I can't be the only one dealing with the 2TB wall.  Do I force a solution in VMware?

I'm on mixed ESXi 5.0 and 5.1 clusters right now if that matters.