The other aero helmet benefit is keeping your head warmer in winter months.
I've seen the Giro Aether recommendations, but the Giro quasi-aero helmet I believe is the Vanquish.
Comp Cyclist has some good discounting at the moment on the Oakley Aro 5 which is another aero-ish type. FYI, the Aro7 (true aero helmet) is $500 at the same store.
If you're looking for a full TT style helmet, Sierra curiously has one of these on deep discount, but just in Medium:
https://www.sierra.com/smith-podium-...reviewsSection