I would risk it for a biscuit with the tricore. Sure, it might not unlock to a quad, but it's still three cores instead of two. And cheaper than the X4's. So you can put a bit of money towards the Lian Li you specc'd in the first run.
And while unlocking isn't guaranteed, people are still paranoid that dual or tri chips with disabled cores are chips that have faults. Sure, while a good portion of them might be binned chips it's much more likely that the reason they've had a core disabled is because it's cheaper to disable a core (or cache) than start a whole new manufacturing process for a specific chip.
Which makes me wonder. Why was the Athlon II dual core a native dual core design, as opposed to a quad core design with two cores disabled like Phenom II dual cores
¯\(°_o)/¯