What should I get? I heard Demon Souls is hard, but that won't scare me away from the game. It also has online, and some of my friends are getting it so I could play with them. 

Batman : Arkham Asylum on the other hand, is amazing. I loved the demo, the game has a meta score of around 90. It comes with exclusive Joker dlc for the PS3 version.

What should I get and why?

Both

get them both.

If I get both, then I won't be able to get Uncharted 2. And that would be a " BIG " mistake.

Get all 3?

I wish I could give you another option, but they're all amazing. Demon's Souls, I would imagine, would provide you with more play time.

That a tough question. If you can somehow get the money then I highly recommend all 3.

I've never heard of Demon Souls. But a lot of my friends have Arkham Asylum & they love it. They have convinced me to get it when it comes out for PC.

BTW, are u a Batman fan? Cause if so, this seems like a no brainer.

Nope, but the game looks good. Damn, you never heard of Demon Souls?

I would say Batman currently because it is already been proven to be a fantastic game I absolutely loved it. Demon Souls.......who knows, it might suck.

Personally I would stick with Batman AA, and Uncharted 2. Perhaps Demon Souls could be a rental upon release. Just too many fantastic games out, and coming out.

Batman AA.

Don't bother with a mediocre game like Demon Souls.