New Member Needing BI/NVR help!

The elite desk can hold two full size 3.5 hard drives plus an M2SSD.... The small form factor Dell can only hold a signal 3.5 drive and an M2SSD... You can squeeze another 2.5 drive in there by removing the DVD player and getting a bracket....
With the elite desk, will it still hold two full size 3.5 hard drives even with a DVD player?
 
I would vote for the HP (Full Disclosure: it is exactly the model that I use): room for two spinning hard drives, low power draw, very stable overall. Don't forget to pick up second low profile Intel based NIC (see the pinned/wiki "Two NIC" Thread).

Edit: Yes, as Fenderman pointed out below, I forgot to mention that in addition to the room for two platter type (storage) hard drives, you generally pick these up with a built-in M.2 SSD as your "system" drive.

Any recommendations for a dual NIC?