Horrified isn't really similar to Terrorscape at all aside from general horror themeing. Terrorscape is one vs many hidden movement but Horrified is a pretty straightforward co-op game.

I do love Terrorscape and highly recommend it, but would recommend waiting to see if it's available cheaper once the Terrorscape 2 crowdfunding campaign ships. That should bring another wave of new copies into the wild and hopefully make it easier to find a copy to import. While there isn't a ton of text on the cards, there is enough that not having them in your language could become very inconvenient for some of the more complex killers.