Having watched both the original and new True Grit, I think westerns are usually the best candidates for a good remake. Limitations in picture quality and acting standards at the time combined with a simple story that speaks to most audiences make them a decent opportunity for technical and substantive improvement.
Besides, Fistful is already a remake, so remaking a remake is hardly an unfair situation.
The Good, the Bad, and the Ugly is a totally different beast though. A remake worthy of that one would have to be epic.
