Best SAN for two R730XD and One R720 and future additions?

Hello,

I have been assigned to find a good SAN for our infrastructure at a reasonable price.  We had a consultant tell us what we need but I don't feel like what he recommended was what we need.  How do you have your environment setup?

I currently have:

2 R730XD - 2 quad network cards, 383 GB Ram, 6 TB Storage each.

1 R720XD - 2 quad network cards,96 GB Ram, 5 TB Storage

I want to add a SAN to this environment to leverage shared storage and my vCenter Standard license, and have room to add another server in the future.  I know I will need switches to connect the servers to the array.

Any help is much appreciated. 

Thanks!