Definitely not Kane and Lynch 2. If you've seen any review anywhere on the internet you'll know just how bad it is. The game is 4 hours long, the graphics are designed poorly and in such a way that they'll make you physically ill, and the gameplay is really bland. Plus, the story is garbage and it ends really abruptly with no clear "ending".
I voted that you should get Demon's Souls because, even though it's balls-to-the-wall challenging, it's actually a pretty good game once you get the hang of it.