I looks like our JovianDSS (ZFS base) product would be best for these IOps to provide the storage for the ESXi. No RAID controller is needed with the JovianDSS only SAS HBA.
Also the use of 2 SSD's for the ZIL or Write Log with a mirror set and large Nearline SAS 7200 drive for the Read Cache. The RAM looks ok as we use the RAM for tier caching with the Write Log/SSD's. You download the JovianDSS and test as a VM or a physical machine for 60 days. Systems that have been tested with different hardware specs are here at the link below with speed and IOps results.

https://www.open-e.com/products/jovi...ified-servers/