POLL Help me choose a game.

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Ok. Here's my situation.

I have a $20 gc to Amazon that I received for answering a survey for Amazon. So, of course I want to spend it on a game and I wanted to spend <$20 cash so I've listed a few games that I have been contemplating.

I thought AC was a good game. I played the BA and GOD3 demo and they were good. Lastly, MGS4 has been raved about by all of you so, I assume its good.

Thanks for your thoughts.

 

EDIT: the prices in poll are BEFORE my gift card.