Lol. OS takes like 30GB. :bleh:
Both Steam and Origin both allows for multiply libraries. Moving your user documents, music, pictures takes like 3 clicks. So realistically you could use a tiny OS drive.
I also see no need to get every single game I own installed all the time. It isn't like I am going to be playing them all. So I use Steam's backup and restore. It takes like 3 minutes to install a game that was backed up.
Ya my os only is fine on a 120 ssd, using about 40 gig but on my gaming rig with games want them all in that I think I might play, Even though I don't play them all, still want them all on the ssd's, would bother me not having them there. Raid is probably getting old these days now, been using raid0 since 60gig drives were out, haven't tryed ssd on its own sept on lr pc.