Need help by buying a new computer...

Yeah I know there are many of these but I just don't get enough to decide from them. So I made a new thread.
So there are like two choices: (you can suggest something more)
The first option is the "safe" one. These would be the parts: (btw I'm leaning more to this one)
-Asrock Z77 Extreme 4 MOBO
-Intel Core i5 3570K CPU
-Noctua NH-U9B SE2
-CORSAIR Vengeance 8GB Low Profile
-Sapphire Radeon HD 7950 GPU
-Samsung SSD 840 120GB
-Zalman Z11 Case/NZXT Lexa S
-be quiet! Pure Power L8 630W PSU
-DELL UltraSharp U2312HM Monitor
And that would be it I think.

Then we have this one. Changed the MOBO and case to a cheaper one and would need a cheaper CPU cooller for a better graphics card. The problem is I don't know if its worth it cause on 1920x1080 it doesn't make that much diffrence does it? So here it is:
-Asrock Z77 Pro 4/ MSI Z77MA-G45/ Gigabyte GA-Z77-D3H
-Intel Core i5 3570K CPU
-For the CPU cooler I have no idea cause they don't sell the Hyper 212 EVO here
-Sapphire Radeon HD 7970 GPU
-Samsung SSD 840 120GB/-Samsung SSD 830 120GB
-Antec One Hundred/Aerocool X
-be quiet! Pure Power L8 630W PSU
-DELL UltraSharp U2312HM Monitor

Is it worth it taking a worse MOBO for a better GPU and spending a little more at 1920x1080??? I haven't done some real overclocking but when I get the new computer I 100% will. So if I overclock the 7950 it will be real close to the 7970?
And if I take the 7950 will the 630W be overkill? I probably can't Crossfire two 7950 later on a 630W can I? But I wanna know what about for just one 7950 can I get 550W or something?

So help me please. Also tell me if there are some stupid things in my build or something. This is my first build so I wouldn't be suprised if I did something stupid.

Thanks in advance.

Okay thanks! The first one it is. And one more question what do you think about the case? I like the Zalman Z11 but I don't really know if there are better ones for the same price or something. But I do like that it has 5 already installed fans

Yeah its good but for some reason its 100€ in my country :S The NZXT Tempest 210 also looks good and is affordable so maybe I'll get that.