What OS? What filesystem?
If you're looking into ZFS or similar I'd highly encourage investing in ECC and, at the very least, a UPS.
(ECC has little to do with 24/7 insurance and everything to do with data integrity (error correcting).)
Edit: Also, you might want to look into a PSU with more SATA connections for cable management's sake, but you can always get a molex adapter.
I am a Marxist. Not the Sanders/Sweden/state bureacracy kind, but the workers' democratic control over the means of production kind.
I often use the debates I get into on these forums to demonstrate logical fallacies to to my students and debate teams I coach. Beware - your arguments are under scrutiny of adolescents and teenagers!