Yakuzaice on 20 April 2008
Well I know you said you didn't want a series of games, but they have a collection of the first three DMC games for $30. But I am not sure if it is price or time that is stopping you.
Pretty much everything mentioned so far is good, so I'll ignore those (but definitely get Ico and Shadow of the Colossus)
Zone of the Enders series
One of the Katamari games
Disgaea: Hour of Darkness
Psychonauts
Sly Cooper series
Klonoa 2
I can probably think of more later.
Edit: makingmusic beat me to a few
