Hi chrstnamarie,
You are certainly looking at some great options and I’m looking forward to finding out about your final choice.
There is more information in post #7 here and post #11 here about cotton vs bamboo and other semi synthetic viscose fabrics. Cotton is a more natural material and bamboo has a smoother feel but you would have a mattress protector and sheets over your mattress so the “feel” of the fabric wouldn’t make as much difference as it would with sheets.
Pillow choices are too subjective and individual to make any specific suggestions but there is some good information in the pillow thread here that should be helpful.
Phoenix