Thank you so much for all of the very helpful information, @scoop. I think that the standard will be fine for me. I have not been able to sleep on my side with my current wedge pillow because the slope is not as gradual, and it irritates the neck. The slope on yours is more suitable for comfort, and it will be so nice to not have to remain on my back all night!

I will check with the store tomorrow to see if they have pillow and cervical pillow.