The graphics card choice is a bit debatable though, isn't it?
I'm not sure how much a workstation GPU really helps with these kinds of software, & is it worth paying the premium? I think only those who use these software packages on a regular basis will be in the best position to advise. What I'm trying to say is that it may be best to pose your queries at a dedicated aCAD, Revit, etc forum as well.
Anyway, whatever he decides to go for eventually, I hope it meets his needs well for the price he will pay. G