I want to buy a new graphics card

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Honorable
Jul 30, 2013
19
0
10,510
These are my specs and i'm looking to by a new graphic card, which card do you suggest me?

Operating System
Windows 7 Home Premium 64-bit SP1
CPU
AMD Phenom II X6 1090T
Thuban 45nm Technology
RAM
8,00GB Dual-Channel DDR3 @ 669MHz (9-9-9-24)
Motherboard
Gigabyte Technology Co., Ltd. GA-890GPA-UD3H (Socket M2)
Graphics
1024MB ATI AMD Radeon HD 6800 Series (ASUStek Computer Inc)
 

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Honorable
Jul 30, 2013
19
0
10,510


i was thinking for this card: SAPPHIRE DUAL-X R9 270X 2GB GDDR5 OC WITH BOOST
it is not expensive and i think its a good one for me, what do you think?
or if i want really good one, i gonna have to change my power supply to, right?