Recently, I upgraded my monitor from an archaic 14" screen to a 24" 1080p screen. Of course, the first thing I did with it was try out some 1080p video. However, my graphics card couldn't handle it. It was so choppy I only got to see a frame about every five seconds. The same video played perfectly on my old monitor, so I don't think it's the computer's fault. I checked out my graphics card and found out that it was only a NVIDIA GeForce 6150 LE. Not exactly state-of-the-art tech. So now, I'm looking for a good, cheap graphics card to buy that will let me play 1080p smoothly. I really don't want to drop $200 for something that I will only use for watching movies in a million more pixels, though. I'm not a gamer and I honestly don't care about getting a top-of-the-line graphics card. So, I'm just wondering what's the cheapest graphics card that will at minimum play 1080p video smoothly. Either that, or just tell me the minimum specs I should be looking for.
Here's the basics of my system:
Operating System: Microsoft Windows 7 Ultimate 64-bit SP1
CPU: AMD Athlon 64 X2 4200+
RAM: 4.00 GB Dual-Channel DDR2 @ 314MHz (5-5-5-15)
Motherboard: Dell Inc. 0HX340 (Socket M2 )
Graphics: ASUS VS247 (1920x1080@60Hz) 64MB GeForce 6150 LE (Dell)
Completely upgrading my computer is an option, as it is getting a bit dated, but, like I said, I'd prefer not to spend a lot of money.
Thank you for your help!

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