Buy Witcher3

Yes yes yes. You will get a lot for your money. It's a game worth playing even if you are vaguely in that sort of theme. I would skip Witcher 1 and just watch a recap on youtube or someone else playing (although it got remake I think...research it) I would for story start with Witcher 2, but seriously you can just start with Witcher 3 as it evolved greately. If you get interest in a lore, just watch witcher 1 and 2 on youtube no need to play it. Not so good of a game mechanic in first two games unless you are hard core fan.