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You can find a lot of good information on GPU rendering & which  video card to get
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at this forum.  
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http://blenderartists.org/forum/forumdisplay.php?44-Technical-Support
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Look through the latest 4 pages.
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Also this sticky:   
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http://blenderartists.org/forum/showthread.php?281673-GPU-Rendering-with-Cycles-Complete-Guide
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I'm very happy with a used Zotac GTX 580 video card.......and even the first card I used,  EVGA GTX 460
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was 10X than the Phenom II 955 CPU. 
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Check Amazon for new & used cards.  It depends also on if your main board has the slot type and 
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power supply to support whichever card you choose. 
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Lots of variables, but using GPU rendering is a huge time saver and worth the effort. 
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Cal 
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On March 23, 2013 at 9:43 AM Geo A <amvgeor@yahoo.gr> wrote:
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Hello,
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Im using the cycles render engine, however im having a compatibility problem as it can't use my GPU and the rendering process takes too long through the CPU only. Im wondering if there's something that can be done to solve this. 
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The only thing that appears under File>User Preferences>System>Compute Device is the CPU option.
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My graphic card is the following:
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SAPPHIRE RADEON HD7870 GHZ EDITION 2GB DDR5 PCI-E RETAIL
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I hope there's some way to fix it! 
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Thank you!
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