It's gotta be the full set. Even though I have the DX12 and I made a custom Bruce Wayne, I think I can repurpose the suit into another figure (Tony Stark), and it'll be ok to have one batsuit in the case, and the other outside to complete the full batman display.
The price is just too good for all 3. Maybe they've conditioned us with all the other figs at crazy price points, but $400 for the armoury (which is essentially a full DX12 figure plus the armoury) and $100 for each Alfred and Bruce is excellent value. Granted they're just recycling a lot of parts, but they could have recycled everything AND gouged us... They know we would probably pay up to $750-$800...