700-800 euro system build, need help

i,m planing on building a rig for around 700-800 euro (in europe components cost often just as much in euro as dollar in america). 

i'm doing a lot for 3d redering in the program bleder.

i'm also doing some gaming. (bf3, assasins creed brotherhood, minecraft, and more,)

blender does make use of CUDA, so a nvidia gpu wil be needed.

i need at least a 1tb hhd, and an ssd isn't needed (i can wait for my pc booting).

i'm willing to overclock my cpu,

i aslo wloud like to use the cooler master cm 690 ii case, but i'm willing to pick another if this is to expensive. 

budget=AMD

I agree with Commissar, if you want to keep it in the 700-800 euro budget, you have to pick a AMD GPU.

okay, what kind of gpu should i get

something like a 7850, 7770, 6790