I think we are blessed enough in this league to have a lot of talent every where on the board. Whether it is forwards, defensemans or goaltenders, there is talent non stop.
Looking at the crease, we have Cedric Robinson, Benjamin Blue, Tommy Tuck that I think would all make it to the all-star game. Choosing a 4th one is tough because of how good everyone is, but considering that the San Francisco Pride had one great year, Chris Partridge gets the nod from me.

Benjamin Blue would be the one with the best save percentage when it comes to the penalty shot. He had faced 41 shots this season on the 1-on-1 and he had a percentage of 0.756. Now, that does not sound like an amazing percentage to some. but only 25% of shooters on penalty shots scored on him, which is great. You can count on Benjamin when you need him, whether it is a shootout or even down a breakaway, he does completly fine.

Comparing to the other goaltenders mentioned:
Cedric Robinson: 0.500% on 24 attempts
Tommy Tuck: 0.727% on 11 attemtps
Chris Partridge: 0.500% on 8 attemtps

Benjamin Blue has the consistency of making the stop on shootouts and he would be my shout to win the shootout competition