Chris, as others have suggest R10 is most likely best for what you have described.
The only thing you have not mentioned is your growth plans. You have plenty of space for R10 now. Look at how much available space you will have with the different configurations and see if they fit within you storage plans and budget. If you have a big project in 6 months which requires lots more disk space you will either want to have the space available or a plan for some extra storage.
Just a thought.
Rodos
Rodos
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