Rodos - yep, initially I was looking for performance, but after consideration with some co-workers, the concensus was that space is going to be more important moving forward.

You're right about the partitioning question... exactly where I'm heading next (especially since I'm running the install in a few hours). What do you think about two R5 arrays (3 disks each) to provide me with about 990GB of space per array? My though it using one array for the operating system drives + templates + ISOs and then the other for my data drives. Or is just going with the 6 as you mentioned a better approach (more space, just lose the separation of drives, but gain the additional spindles to assist with some performance)?

Thanks for your insight. Seems like there are way too many options here!