Wow, i just thought of something. This is sort of a double post so sorry.
But i want to say that what if GTA4 was in 1800 something. Like your an unhonest cowboy dude.
I voted 1960's. I know that they allready have a Gta game in that time period. But it would be fun to see it in 3d kinda. And some cool 60ish misson. Buy some weed. Go to Woodstock hehe