Oblivion GotY edition...?

The graphics quality is basically the same. It is better to keep it on your pc because you can download a ton of mods for it like quests and stuff. Knights of the nine isn't all that good because it is short and doesn't add much content to the game. It does have a good quest line though. Shivering isles on the other hand has plenty of weapons food and creatures and has a awesome quest ling. I think you shouldnt get the game of the year edition and just get shivering isles separately for 15$ at gamestop.