Right, but remember the OP doesn't want to overclock. And no, it's not a "free" boost either: you have to pay for the unlocked multiplier ($20), an aftermarket cooler ($30 min), a motherboard that supports it ($10 more min for one with a good phase regulator), and then you have to spend the time (lots of hours) into getting all the settings right and ensuring that it's stable.
That's quite an investment for something that will only really shine in synthetic and productivity applications.
@OP: Your build is great, and will perform very well. The only suggestions I have are backing the M12II that you already decided upon, and perhaps trawling through the combo lists on Newegg to see if you can get a better deal on the parts you're looking at. For example, you can get your CPU + mobo in a combo on Newegg for $9 less:
right here, brother.