Black outline - is called comic outline in your video options under effects, you can turn it off.
Hazyness/blockiness - another option in video settings under effects. I believe its called 'Soft Particles', turn it on and that should remove that problem.
You have to have 'Post Processing' option turned on to do either of these, but I have to assume that since your game has them on that post processing is already on.
What Server? - The only one they have. Its a one server game just like Eve Online with a bunch of instances within that one server, and yes you can move to any instance that isn't full.
My comp specs:
Vista 64
8GB of ram
3GHz dual core(O/C'd to 3.8)
ATI HD4850X2 with 2GB of ram
but your comp should run it just fine. Just realize there are some issues right now that they are working with Nvidia and ATI to fix. They built the engine for this game from the ground up so don't give up if you do have some issues, their tech support is pretty good about helping(I know as I am dealing with one of them currently for an issue I am having)