A lot of people say Ico and SOTC which is weird. I got Ico randomly back when it was released and thought it was a bit dull, then sold it, and I have SOTC just because my boyfriends older brother thought it was crap. They're pretty good but if you have to spend a ridiculous amount of money to get them it seems like a waste.
I guess maybe the God of Wars, but I might get the collection when it comes out.
And back in the day I'd say Munch's Oddysee, but what started out as an awesome looking game turned into something a bit crap, so never mind.