Ah, so this was an "obsessive-compulsive" thing, huh?!
PS CS and I haven't had enough time together yet for me to give you a good answer. I'm much more the "technician" in this group, instead of one of you creative types. I've pre-ordered Deke McClelland's PS CS Bible, but I'm not sure exactly when it will be released and shipped. Until I get a decent book I can't do much more in CS than I can in Elements, which means not a whole lot. I was fooling around with some 48 bit scans the other day, and what I learned was useful but interesting. If you don't have a great photograph to begin with, you sure don't want to scan it in 48 bit depth; all it does is add more artifacts that have to be edited out! I'm still getting used to the new computer and scanner along with CS, so most of what I've been doing has been pretty simple stuff.