You asked for one so that's all I will recommend...another vote for Ninja Gaiden.
Haven’t played them all but of the ones I have, I’d say Ninja Gaiden. It looks and plays amazingly.
That said I’d recommend a game not on your list - Panzer Dragoon Orta. One of my all time favs and also looks fantastic.
Out of the ones I've played or seen in videos I'd either say Jade Empire or Ninja Gaiden. SSX 3 looks really good as well.
If you haven't played any of those I'd say grab KotOR.
Morrowind still looks pretty rough even with the upgrades.
Thanks for the recommendations. I went with Ninja Gaiden and splurged to get KOTOR also. I’ll pick up jade empire next. Even though it’s highly praised, after watching some gameplay videos, I’m not sure Panzer Dragoon is something I’d like.