Both Dark Souls II and Dark Souls III are 75% off on the Humble Store. The discount will end when Dark Souls Remastered is released May 24th.
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Do any of these have a decent kb/m interface. I know dark soul i totally suck even with mod.
DS3 has a perfectly good keyboard/mouse implementation. You'll have to tweak the sensitivity, maybe turn off acceleration somewhere (I can't recall), but it works really well after your initial setup. Better, and a lot easier to dial in, than the original DS with the kb/m mod.
I haven't played DS2 so can't comment there.
Note that DS: Remastered was actually released yesterday, and these Humble sale prices are going away in less than half an hour.