SAPPHIRE Radeon GPU help

[intervenience]

I'm looking for a graphics card for my computer and I'm leaning towards SAPPHIRE cards. However I don't precisely know much of the differences between graphics cards so I was hoping someone could assist me with choosing a card. Budget is between $100 and $200. Monitor is 1920x1080p, for gaming and PSU is going to be 650W Corsair.
On Newegg.com there is a 6870 HD SAPPHIRE for $169.99 but on a website with computer parts in my country there is a SAPPHIRE 7770 for $143AUD. Which of these would be the better choice for this computer I'm planning to build. This is the last piece that I need confirmed before I can get it for my birthday. Thanks the links are below.

http://www.newegg.com/Product/Product.aspx?Item=N82E16814102948
http://www.msy.com.au/product.jsp?productId=8935

 

[esrever]

the 6870 is more powerful. If you live in Australia then you won't be able to buy from newegg.

 

[purple stain]

What are the full system specs?(CPU,RAM,etc.)

The 6870 is more powerful than the 7770.

Can you order from this site?

http://www.mwave.com.au/sku-42060781-HIS_Radeon_HD_6870_Video_Card_-_GDDR5_1024MB_128Bit_VRAM_-_900__4200MHz_Clock_-_

 

[intervenience]

What are the full system specs?(CPU,RAM,etc.)

The 6870 is more powerful than the 7770.

Can you order from this site?

http://www.mwave.com.au/sku-42060781-HIS_Radeon_HD_6870_Video_Card_-_GDDR5_1024MB_128Bit_VRAM_-_900__4200MHz_Clock_-_

i5 2500k 3.3GHz processor 1155 pin, AsRock Z-68 Pro3 1155 pin motherboard, G.Skill Ripjaws 8GB of RAM, Corsair TX-650 PSU, Seagate 3.5" 3TB SATA3 HDD.
So this Radeon 6870 you've linked can outperform this Sapphire 6870?

 

[intervenience]

the 6870 is more powerful. If you live in Australia then you won't be able to buy from newegg.

Oh, I thought you could order stuff from there... Thanks for reply by the way

 

[fantastik250]

The sapphire 6870 has a higher clock than the one that was linked by intervenience.

 

[purple stain]

They are the same.The 6870 isn't that great at overclocking so even if it has slightly higher clocks it only translates to about 1-3 fps.