New graphics card help. Dell XPS 8300

Hey folks, new member here. I have a Dell XPS8300 and I'am looking to get a new graphics card since Diablo 3 is coming out soon. I'm not tech savvy, so any help would be greatly appreciated. Here is the specs on the desktop.

Processor --- 2nd Generation Intel® Core™ i7-2600 processor (3.4GHz with 8MB Cache)

Memory3 --- 8GB4 DDR3 SDRAM at 1333MHz

Hard Drive --- 1TB - 7200RPM, SATA 3.0Gb/s, 16MB Cache

Video Card --- AMD Radeon™ HD 6450 1GB DDR3

I'm basically looking for a card under $200 that will give me the max performance allowed on Battlefield 3 and D3. I read some other sites that you need to know the desktops watt max and how many slots it has before a graphics card is even considered. What would you guys recommend I get? Any Suggestions as to the cards?

Thank you for the help gents.
 
Any PCI express card in your budget will work. Just pay attention to the power supply requirements. Those Dell's aren't noted for having good power supplies
 
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