If it's pts only, what I do in one of my leagues is this:
4 for a W
.1 for a SV
-.3 for a goal against
2 for a SO
That means that a goalie who wins and has a good game does the best.
A goalie with a good game but loses, and a goalie with a bad game and a win, both do fairly well.
A goalie with a bad game and loses does pretty poorly. Especially if they get pulled.