I think perhaps the best way to do this would be for OP to make a list of all credit cards, then as and when people post up the 'best' offer it can go against it.

At present we have only about 5 CC's mentioned - all the 100k offers, which I don't think was necessarily the point. Someone might be interested in taking out the BA AMEX and want to know whether 1k bonus miles is good or not historically.

Also worth bearing in mind the difference between UK/US offers vary a lot.