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Or should I wait?
It's not going to get any cheaper for a while.
The game was just released and it's 20% off for only a few more days (Jan 31 is last day with the discount).

It might see a larger discount during the next big sale, but the game is good enough for the undiscounted price.
I think it's really awesome game :) After a long time I really enjoy playing a game :D
Green Man Gaming apparently has a coupon code you can use to get the game at $12 standard or $18 collector's. Steam version though, not GOG.
GoG version better because if you buy in first month they give free DLC . This is reason why I bought it GOG . Also DRM-free :)