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Extreme GPU: AMD Radeon HD 7970
If the GeForce GTX 690 is too rich for your blood, and you're happy with what is essentially the second-fasted graphics card, then the AMD Radeon HD 7970 is the card for you.
For about $50-$80 less than the GeForce GTX 680 you get pretty much the same performance, and a card that will take anything you can throw at it.
There are overclocked GHz versions of the AMD Radeon HD 7970 available for an extra cost, but to be honest, most regular AMD Radeon HD 7970 cards are already well overclocked and paying extra gains you little in the way of performance.
You can pick up a Radeon HD 7970 for under $400, making it a far more sensible buy than the GeForce GTX 690.
Price: From $400.
Image source: XFX.
Mainstream GPU: AMD Radeon HD 7850 2GB
While buying the most powerful graphics card gives you bragging rights -- for a while -- you can get excellent performance from a more mainstream cards, and at a more mainstream price.
The AMD Radeon HD 7850 2GB gives you a powerful card that can handle modern games without breaking a sweat at a price that's far easier to swallow than going for an extreme card.
Make sure that you pick a Radeon HD 7850 that has 2GB RAM, and not the models with only 1GB. The extra video memory will allow you to crank the texture quality up higher, and help keep the in-game framerate more stable.
Price: From $185.
Image source: Gigabyte.
Budget GPU: AMD Radeon HD 6670 DDR3
A budget price gets you previous-generation technology, but the AMD Radeon HD 6670 is a very capable card which has the power to handle any modern game you throw at it -- just keep your expectations realistic and don't plan on cranking the settings all to max.
Remember to look for the DDR3 models of these cards, as you'll end up paying the extra for the faster GDDR5 RAM.
Price: From $59.
Image source: SapphireTech.