Did you follow the win7 setup guide in the tech help forum? It contains some tips related to issues encountered on multi core systems (which is basically all at this point)
Yes I did and I have already been following those tips before swapping out graphic cards.
Just for fun, I ran 'trace fps' and tested with and without 3 henchman. Having the three henchman exacerbated the problem areas significantly but had little to no effect in the other areas. I've also been tinkering with caching some scripts since it does help on single player mods. Unfortunately the script caching seems to have no difference.
But I don't want to derail this thread with the challenges of my installation. I think the general consensus of this thread is as follows:
1. Choose NVIDIA over ATI
2. Get the best NVIDIA card you can afford and have room in your computer for ($70 for a single slot, $140 dual slot).
3. Optimize your settings based on the info in the Tech Support Forum.