Saddle rec for a tween-ish boy?

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One of my super skinny-azzed riding buddies has one of those Cobbs and seems plenty happy with it (though I haven't asked him particulars ). If he can handle a true wedge shape, those things have a huge cut-out.

I don't think we'd want to spend that much, but I'm suspecting that some sort of relief up-front would help him. As much as I love my Bontragers I'm thinking one of their mtn. bike saddles might be perfect for him, especially since they come as small as 128 wide.