[Trivial Psychic]

If you only could go with one, I'd recommend the Part 3 Jason by NECA. I know you have your reservations with the sculpt, but the head sculpt is a dead on representation to that character's appearance in that film. The accessories it comes with are great as well, and will work perfectly with all of your other NECA Jasons, so the play value is there as well.

The recent 1/4 scale release is amazing in hand. I have it and the recent Sideshow Toys 1/6 scale figure, and the NECA version blows it away in my honest opinion, and is about 100 bucks cheaper.

If I had to recommend one figure outside the NECA releases, I'd go with the Uber-Jason (Jason X) figure from McFarlane toys. While it's essentially a statue, what it lacks in articulation, it more than makes up for with an incredible sculpt that looks great on the shelf.