ICO itself is pretty cheap, it's just a pain in the ass to find... I tink they're selling it for around $20?
The same guys who did ICO also did Shadow of the Colossus. Similar elements, similar characters, similar price.
Um... similar games. Some similar elements also pop up in "Silent Hill 2" but it's markedly more violent and darker, losing much of the themes of innocence and storybook romance that ICO has.
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Your group seems to want something quiet, emotionally moving, timeless, beautiful, and with very little controversy or violence. It makes sense, but I think you've got a lot of work lined up for you. Games like ICO are one in a million. All the best.
For more information, this is a pretty good page.