Continuing to work on a resolution to this situation, I hadn't mentioned that when set my soft proofing to a specific paper in both Aperture and Photoshop, the images are fairly close in color and brightness. Not identical, but close. So, that is somewhat of a relief. And, no, I actually haven't printed out of both apps to see the results. The reason being, I have always printed out of Aperture. Its probably time to try Photoshop for comparison.
That said, I do post to web galleries, on-line photo competitions, etc, so that color working space is important for best screen viewing. Just seems that Photoshop is rendering ProPhoto RGB differently than any other app on my Mac and I haven't found out why.
I do appreciate some of the comments, as some folks reading this thread will learn about soft-proofing vs color space, if they didn't before.
FYI...attachments screenshot of what I am referring to attached.