Hp N36L With Whs2011 - Need More Space

Hello forum

I have a HP N36L Microserver running WHS2011 with 5 HDD's installed inside and an external 2TB drive connected via USB to backup the OS, client backups and pictures folders. This is a great little machine and I honestly don't know how I managed without one! I've been ripping my DVD collection to the drives but I'm rapidly running out of space. My other half says I "should just delete stuff' but that's not in my nature!

Please can anyone suggest a HDD tower that I could connect to server (maybe I'd need an extra SATA / RAID card if USB is not suitable?) that I could add additional HDD's to so they can be seen and used by WHS2011?

I'm torn between doing this and just buying another Microserver. In the UK HP are continually running a cashback offer meaning that a N40L can be picked up (after the rebate) for around £120. I could install W7 onto this (I have a copy I was saving for Boot Camp if I ever get a Mac!) and then just use this to hold my movie collection and leave my server to do what it was designed to do.

To use the words of Princess Leia Organa, "Help me WGS Forum, you're my only hope!"

Thank you