what graphic card for AutoCAD? suggestion?

[Anonymous]

This will be my pc configuration

CPU INTEL i7-3770K 3,5 GHZ 77W LGA1155 
Cooler Master Hyper 412S 
Samsung SSD Serie 840 Pro 128GB SATA III
motherboard: MSI 1155 Z77A-GD65 
power pack: Seasonic G-550 
CASE Corsair Carbide Series 500R Black
RAM DDR3 1600Mhz PC12800 8GB Corsair Vengeance 1.5V CL10 (2x8GB)

Data discs in RAID 1 configuration

Western Digital 1TB WD1003FBYX 7200rpm 64MB WD RE4 (*)
Western Digital 1TB WD1003FBYX 7200rpm 64MB WD RE4 (*)

What kind of graphic card do you suggest? My budget is about 400 €

I thought 

VGA Asus Radeon HD7970-DC2T-3GD5 DirectCU II Top Core 1GHz Memory GDDR5 5600MHz 3GB DVI DP

[pendean]

One of many online reviews of Vid Cards on the market:
http://www.pugetsystems.com/labs/articles/AutoDesk-AutoCAD-2013-GPU-Acceleration-164/

[Anonymous]

So.. i read test and it is really clear; with my budget i think i'll have a GTX 680 or less!

Thank you for your answer...

if i can i wolud have an explanation about all those graphic card:

i read about nvidia gtx 680 for example... but... i searched on line and there are many many types of gtx 680..... why? ...and also prices are really different!!!

for example what do you think about this:

http://www.prokoo.com/gigabyte-gtx680-windforce-version-2xdvihdmidp-p-45771.html