Of the list probably John Carter, N.O.W. and 'The Expanse' (even though I'm fairly sure the actual Expanse started out as an RPG before becoming a novel, and now being turned back into an RPG, but under what is presumably a different system than what originally inspired it).
However, to be honest I have no reason to buy anything on the above list simply because I'm unlikely to run anything on the above list. I loved John Carter as a kid, but I can't imagine running a campaign on Barsoom. N.O.W. seems likely to be a solid system, but I've never felt the need to run a game in 'the now'. And if I did run a near future science fiction game, I'd probably do it under N.E.W. and roll out my own setting - but even so I've delayed buying the otherwise very excellent N.E.W. books simply because I don't foresee running a science fiction game nor do my current players seem interested.
I expect most of my 2018 purchases to be for CoC, either classic stuff or the very well done 7e stuff that I can easily adapt (Grand Grimoire and The Star on the Shore are high on my priority list). I also have some Mouse Guard stuff and some Pendragon stuff on my Christmas wish list, and might buy some N.E.W. stuff just for reading purposes.