Hiya guys i just wanted to know your thoughts on what gfx card to buy.....

HIS 4870 X2 - http://www.overclockers.co.uk/showproduct.php?prodid=GX-101-HT&groupid=701&catid=56&subcat=1235&name=HIS ATI Radeon HD 4870 X2 2048MB GDDR5 TV-Out/Dual DVI/HDMI (PCI-Express) - Retail

OR

eVGA 280GTX SC - http://www.overclockers.co.uk/showproduct.php?prodid=GX-067-EA&groupid=701&catid=56&subcat=1176&name=EVGA GeForce GTX 280 1024MB SC Edition GDDR3 TV-Out/Dual DVI (PCI-Express) - Retail

So whats the better clocker and thoughts on temps etc? I will be buying a EK block for whichever i buy, that's for sure
Regards

Lloyd