The forged crank is listed for 950 bucks. Scat cast steel cranks are quite a bit stronger that the factory cast iron. I'm not sure i would swing the extra 650 for forged unless i were trying to build the world's most powerful IDI GM diesel
I'd go for the Scat cast steel crank any day over a stock crank and then install a Fluidamper balancer. You have yourself a good, strong bottom end to build on with then. $299, hey that's a good price too!