What graphics card should I upgrade to?

[SuperToaster]

Right now I have an ATI Radeon HD 4350 which seems to be bad for gaming, so I want to get a new card, but I have heard that some don't fit with some computers, so I want to make sure I get the right one. I want it mainly for playing games without them lagging. I want it, maybe, around $100 but if there is a better one for a little more it's good for me. My monitor's resolution is 1360x768 pixels. 6 GB of RAM. Processor is Intel Core i7 CPU 920 @ 2.67 GHz. I have Vista Home Premium x64. If I missed anything, tell me please. Thanks for any help

 

[djangoringo]

Just get a 7750 1GB DDR5.

 

[photonboy]

Or the HD7770. It's slightly more than $100 but I recommend it as a minimum for most games now. Here's a good card:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814121663
*This card is $120 after MIR but comes with a Far Cry 3 coupon ($60 full price). Hard to beat that!

SIZE OF CARD:
Measure inside your computer but it's likely you'll have no problems.
*I recommend you use FRAPS when starting a game and tweak the quality settings to keep the frame rate as high as possible.

You can even use RadeonPro to:
a) enable VSYNC when not supported in-game
b) enable Anti-aliasing when not supported in-game

 

[SuperToaster]

Best answer selected by SuperToaster.