you will have about 81.81TB BEFORE any raid and with over 8 disks i would do a Raid 6 however that board only does Raid 0,1,5 and 10. So in a raid 5 you would have about 72.72TB usable.
Dont forget to get good Drive, such as WD purple or gold!
note: 10TB WD gold drives after format have 9.09TB available (according to Windows)