Graphic card Upgrades

Hi, I am new here, so, Hello...I have been looking to upgrade my graphics card. I have a Amd athlon 64 with the nforce 400 motherboard,(I think). I have the nvidia 6100 inegrated built in chip right now and have a PCI Express slot to use for a nrew graphics card. I dont do any gaming as of now, but do alot of video editing and dvd playback. What would be a good starting graphics card to upgrade too under $150.00 Thank you...

Hello fbird93 ,welcome join in and I just know that PNY GeForce 7900GS Graphics Card is good aroung your budget ,but I am not sure if your parts can work well with it . That card with the 256-bit memory interface .