I ordered a Radeon 7750 as it seemed to be the best bang for the buck. Before it arrived I took one more try at calibrating my monitor, this time I lowered all settings to 60-70%, as the default settings were all quite high. I then calibrated and it seemed to work this time, photos have a lot more detail.
After installing the 7750 I recalibrated, but didn't notice that much of an improvement in sharpness. I am not using a high end monitor though, but, this monitor was recommended for photo editing by a photo site.
The 7750 did clear up some other issues, stuttering video, video freezes and slow performance. The Nvidia 430 is in a much different class than the 7750 and could not compete with the performance of the 7750. I use my computer for many different things and often there are a few graphic intensive processes operating at the same time. The 430 was a decent card for one graphics intensive process, but once you had two or more running it would start to slow down and at times freeze processes for varying lengths of time, but it never locked up the computer.
We will keep the Nvidia 430 as a spare in the event that a video card fails on one of our 2 computers, then at least we won't have to rely on the limited choice that we have locally for computer parts.
Thanks for your help.