Revengeance for half the original price, after Konami announced it's reducing Metal Gear Rising's tag to $30. If you're still unmoved by that reduction, Konami is chucking in two bits of free DLC in the form of the Jetstream and Blade Wolf side-stories.
It's unclear if the free DLC will be bundled with copies sold at the new price, or if they'll simply be made free on the Xbox Games Store and PlayStation Network. At the time of writing, we're didn't see online retailers reflecting the reduced price with any detail about the DLC. Also, Konami's announcement doesn't touch on the downloadable PC port, which we last heard about in June when it was coming "soon."
Revengeance was one of 2013's first big-name (and silly-name) arrivals, and Raiden's return was a happy homecoming according to our four-star review. As Ludwig put it, the Platinum Games-developed hack-and-slash is "seriously sexed up Fruit Ninja fan-fiction," a phrase we're still reeling from eight months later.