I picked up a 5.7 block with all the machine work done for $400. I think the budget conscious will chose the 5.7. Those blocks can be had for $200. That block punched to 400+ with the 09 heads would make a stout package with a reasonable budget.
I think you also have to look at HP per dollar. Let's face it, most eddy/RHS headed 408 combos are done at 500-525HP and with a weaker block. I think the new normal for these stroked hemis with carbs is going to be in the 600HP range.
I just saw another build today with the a 6.1L blocked stroked to 426 that had the 09 RT heads and an EFI street/strip cam in new challenger put down 560 to the tires through an automatic!