They're both great… I don't regret getting my Soul at all, the handling's better than a 456 and the weight difference is pretty substantial, it's just plain nicer to hustle a lightweight bike. Yes it's expensive but it's 100% worth it, in my book, the only thing I'd like more is a newer model Soul.
But, I'm sure I could have been happy with a 456 as well, they're very good and stupendous bargains. And you're unlikely to regret buying one because the used prices are absurd, I've seen them sell on Ebay in a horrible state for as little as £10 less than the new price.
I would write off the standard Inbred though, it's nice with 100mm but really with anything longer than 100mm feels exactly like any other XC frame with too much fork in it. The fact that it's warrantied for it doesn't mean it's a good combination. And on top of that, the Scandal does the same job better.