For me at least: the single SSD got boring after a while and I wanted to get better speeds. As for storage I have a 2TB (RAID 0 as well) HTPC ( <a href="http://paulstamatiou.com/how-to-build-microsoft-windows-7-intel-core-i7-pc" rel="nofollow">http://paulstamatiou.com/how-to-build-microsoft-windows-7-in...</a> ) that keeps most of my media and usenet junk, then an external for other stuff.