The price will drop on LA Noire. I bought it for $40 on PS3 soon after came out (that was a great price at the time!) and now Amazon has it for $18. I wouldn't have minded except the game didn't really grip me and I still haven't finished it. I should have waited.
But that's me. If that's the game you really want and you have the money, then sure, treat yourself. But since it sounds like there are others you're also interested in, I'd buy the cheaper games first and wait for a price drop.
(GK2 is one of my all-time favorites, by the way...)