The honest answer is probably that all of them will do what you want. Unless you're gaming or video editing or something else that requires extra power, any one of them should do just Internet and office functions, which need a lot less grunt.
Personally I would have a look for a good spec secondhand one with Windows 7 on, I'm yet to be convinced of any reason to go to 10. They gave 10 away for a reason..... to turn it into a subscription service down the line, that's why you no longer have control over the updates.
For just Internet and basic office you could even get rid of Windows altogether and go Linux Mint, does those just as well, better if you hate the MS Office versions since 2010 with all the hidden functions, ribbon and so on.
Would have a look at sites such as PC Advisor and Toms Hardware if you want new though.