I could swing either way on this question. You mention that you don't do anything very graphically intensive. And the HD3200 is definitely one of the better onboard graphic solutions. In my mind i wouldn't even bother with the x1950pro as it will just consume power sitting there. If you have no intentions of gaming you might be better off with the HD3200. It supports DX10 and has several HDMI functions. Your PC would also run cooler as the x1900s tend to run really hot.
Just my thoughts. More graphical power doesn't always mean better for certain situations.
the ATI drivers and CCC can be really bloated. As in they take up alot of memory. I am not sure how the HD3200 drivers are, they maybe just drivers with no CCC. If it uses the system memory it may take up less memory to use the onboard. I also know some of those boards use sideport which gives the onboard GPU direct access to the RAM. Does the HD3200 have it's own dedicated memory? i know some of those onboard cards do.
RAW images in photoshop are nothing, any onboard chip would work for that. Photoshop is just memory intensive.