Best big, fast backup storage for Windows 7/8?

Hi,

What's a good, fast, reliable backup storage solution (8+ TB) that works with Windows 7? Are there RAID 5 arrays that support both high-speed ethernet and USB 3.0?

The RAID 5 names I'm seeing on Amazon are:

1) enclosure-only and I'd prefer enclosure + drives
2) companies I've never heard of, although I don't keep up with hardware diligently

I'm on a quad-core Dell that's several years old and has one USB 3.0 port, the rest are USB 2.0 ports.

My typical setup has 3 copies of the data:
- Primary was a 4 TB G-RAID (RAID 0) that got corrupted and I've been doing recovery on it
- 1st backup was a 2TB G-RAID (RAID 0) that filled up some time ago so it's out of date. Shouldn't have let that happen, I know....
- 2nd backup is the MyBookLive (single-spindle) drive that has only an ethernet port so it's attached to my Gigabit router as a network drive.

The MyBook Live is dog-slow for this data volume so I want something faster for the next time I need to restore.

I bought a G-RAID 8TB (RAID 0) yesterday that I'm copying the MyBookLive's data onto right now over my network, hence the severe I/O bottleneck. It's so painful I want to replace the MyBookLive with a RAID 5 or RAID 0 or something else really fast and reliable, that holds 8+ TB of data.

If it has both 1Gb or 10GB ethernet + USB 3.0 then I can back up to it over the network and restore using direct attach, that would be much faster than what I have to do now.