>>308538483
I upgraded from Rift S to Index and found the refresh rate wasn't super noticeable for me so don't worry about that desu. 

It's not worth going from CV1 to Rift S since it's just a sidegrade. If you're really keen to upgrade to something I would consider the new Reverb or the Quest 2 + Link after there have been some reviews. I know a few anons that have pre-ordered those headsets so you'll probably hear from them shortly after release.