Get a 64GB Adata premier pro 900. They're only 65$ and perform really well. Yes, 60-64GB is plenty enough for only your OS. If your like some people and want to start putting games and apps and music on your SSD, then ofcourse your not going to have the room. But if your like me and only put your OS on it then leave it alone, it will definitely be enough. I'm 100% sure of this, many people do this. You just gotta make up your mind on if you want to put games/apps/music/movies on your SSD or your other HDD.