If I had a Master System, I'd probably get Ninja Gaiden but since you explained that the game is somewhat of a sequel... I'll hold off on it.
As for your unboxing... I believe the PS3 version, if available, gives more bang for the buck considering that, if I remember correctly, there are more extras to be had. Didn't know you posted an unboxing video beforehand, but when I saw that the version you bought was the Xbox 360 version, I instantly found a topic to talk about with you.
As usual, if not yet mentioned, your video game collection looks awesome in the background!