Personally, I run a 60Gb Agility 3 with no problems. Windows 7 and a few programs, 16 gb free... That being said, a friend of mine was the one that originally bought the 60gb, then later sold it to me because he ran out of space, then he bought a 90gb, ran out of space again, and ended up shelling out near 200 euro for a 256gb drive.... KNOW HOW MUCH SPACE YOU USE. I have all my games on another storage drive, (yes, steam and origin are installed on that drive, not C) and all my music is on my HD as well. Dont go too small, and if you do go small, make sure you know how to save stuff in other places...