Just because someone gets great temps with a certain setup does not mean anyone with the same processor can. Chips are all different.
Even still, you'll need to use a special water block with the tec because just putting it between your block and your cpu would crush it.
You'd need something like this.
Petra's Tech Shop
Note how it has an extra copper plate that holds the peltier in place without subjecting it to the large pressure required between the block and cpu.
Even with something like that, your looking at a good $200 easy. Plus that loop will now be too hot to cool any other components.
You'll also need to worry about condensation around the cpu socket and you will have to insulate it to prevent shorts.