Building new AM3 system- What GPU and Case?

Hello friends!

I am building a new system, here are the following specs:

• AMD Phenom2 X4 955 3,2Ghz, AM3
• 650W Corsair CMPSU-650TXEU
• 4096MB (2x2048MB) DDR3 PC12800 Corsair XMS3
• 750GB Samsung SpinPoint F1 HD753LJ
• Gigabyte GA-MA790FXT-UD5P, sAM3

This is supposed to be a gaming system.

However I have a few problems that no matter how much I think I can't make a decision;

What GPU should I go for?
I have used nVidia all my time and feel very comfortable with it. This system is going to be a gaming system as I said and my monitor is going to be 1920x1200. I want to be able to play games without going down to low or medium (It's ok if I can't max settings)

What case should I go for?
I have absolutly no idea what I should go for. Something that keeps my stuff cool, no big worries if it makes noise but as long as it's good, can stop hdd vibrations for example and so on.

What would you change?
Is there anything in the system above that you would like to change?

Thanks!

have a look in the charts section of this site

look at the vga charts to guide you to your gfx card

alsio look at
\http://www.guru3d.com/category/vga_charts/

1. Drop your Processor to a PhenomII 940 and then OC it, trust me it goes up to 3.2ghz stock everything.

2. As for your CPU, a 4850x2 would do good at that resolution, or if you have the money, a 4870x2 2gb, and if not just go for the 4890 1gb.

3. The case if completely up to you haha, I would personally go for the Coolermaster Storm Scout, its a neat case with good airflow, very portable too. sexy looking!

4. Nothing else I'd change, looks good. the rest are completely up to you =]

I would suggest dropping to an AM2+ system with a 940. It's quite a bit cheaper ($55 processor, then RAM on motherboard and less as well)

4850X2 would be nice. If you must have nVidia, I've heard only good things about the 980a chipset, though, despite it being a rebranded 780a. The Foxconn Destroyer is also cool.