Best Synthetic Bag/Quilt For Dall Sheep Hunt

[Newbie Sheep Hunter]

I’m going on a dall sheep hunt this August and looking for the best sleep system for the hunt. It will be my first backpack hunt. I have a down allergy, so will need to go synthetic. I’m a side sleeper. Obviously prefer something as light as possible, within reason. I want the best system and am not worried about cost.

Zenbivy seems to get a lot of love on these forums and I see they just came out with a 25 degree synthetic option. Is that the way to go? Would the 25 work for late August in Alaska? And if the Zen, just buy the quilt and sheet or get the whole zen combo?

Any others I should consider?