I could not get an ATI card to install in my old pc so I went with nvidia and it went with no problems.  I have heard that ati and intel work well together while nvidia and amd  are a good fit. I dont know if any of that is true. I am using a nvidia 6200 card at the moment and it runs all my graphics stuff nicely.  Check the opengl support and decide if you are a game player because that will be more important than Poser at this time .

Sadly your old machine is better specs than mine :(