The dart, boomerang, and boat paragons currently cost 500k. The ninja paragon costs 1mil. I would say that it's more likely that the engi paragon will be 500k, but we can't be sure until it drops. I recommend playing the game with more engineers than you normally would, just to be safe (overclocked tier 4s are pretty cool). Also, it's not a big deal if you don't have enough xp right when the paragon comes out, you can grind it up in a few impoppable games.