Dell PowerVault NAS Solution

My goal is to create a NAS server for my home that I can back up everything to and then back up to the cloud. I know there are pre made NAS solutions but I want to build my own. Right now I'm looking at the PowerVaults, but Im new to the mass storage servers. The Red drives from WD also look like a nice option to fill it with once I get a chassis. Are there any better options out there, want to keep it sub $500 USD.

Just realized that the PowerVault was DAS, Im looking for more of a iSCSI type of server.