Best $100-150 sleeping bag for summer backpacking?

Looking at the following, any suggestions welcome.

Big Agnes Anthracite 30 for $97 - 2 lb 6 oz, 8 L
Marmot Trestles Elite Eco 30 - $114 2 lb 4 oz, 17 L (?)
Marmot Always Summer 40 - $140 2 lb (down)
Kelty Cosmic Down 20 - $190 ($150 REI sale?) 2 lb 11 oz

Crazy to get a 20 degree bag for mostly summer backpacking in New Hampshire?