both of the laptops are great, and are very similar...
the NP700Z5C has a slightly faster processor, but I would still go with the other one (NP700Z5CH) because I just prefer windows 7. also, these laptops are not touch screens and windows 8 is more inclined for touch screens.
you will not regret this buy
Amazon is very dodgy on this question -- I have a suspicion that they have a "soft" return policy, one which may even vary across customers as a function of how much they buy (and return). In any case, I have had several CSRs basically say "you can return the computer within 30 days, no questions asked, IF you pack it perfectly and it is returned in new condition." Of course, they couch answers like that in phrases like, "we want you to be happy/100% satisfied."