Which hemi? 6.1 for $4000 or build forged 5.7?

having a thicker cyl wall will be key when it comes to making big power. Main caps can be made custom to handle the power. I see the block as being the limiting factor on a huge power build. Lets hear the opinons of sheradon and inertia on what block is better excluding the main caps and any other thing that can be bolted to it. I know the 6.1 seems to fail at around 1000rwhp what about the 5.7? Anyone seen a failure of a 5.7 due to "too much power" (if there is such a thing)