Guild Wars 2

my old system is an Intel Q6600 2.4 on a Gigabyte P31-DS3L mobo.The RAM will be 2 sticks of KINGSTON KHX1600C9AD3B1/2G 2GB HYPERX DDR3 BLU.What gaming card should i install?

i m getting this upgrade for my PC in a few days.Will it run GW 2 smoothly? AMD PHENOM II X4 965 3.4GHZ QUAD CORE BLACK BOX EDITION
ASROCK 970 EXTREME4

KINGSTON KHX1600C9AD3B1/2G 2GB HYPERX DDR3 BLU
SAPPHIRE RADEON HD6570 2GB PCI-E
Any advices would be great!!!!!Thanks in advance!!!!!!!!!!!