FinderMinder is a great product which can intercept Finder windows when they are opened and adjust them to any setting you wish. It basically runs an AppleScript that performs the Finder window adjustments just as the window is opening.
The net effect is that you can trim the Finder window button clutter by setting the side bar to invisible, the tool bar to invisible and anything else you wish to hide.
The only gotcha is that you have to drill down into the apps's 'Package' and edit the AppleScript by hand. The edit is very simple though, changing "true" to "false" or visa versa.
FinderMinder -> http://www.irradiatedsoftware.com/labs/
how it works: https://vimeo.com/72299758
This is not an ad, I have no stake in the company or the product. The product simply saved my sanity with the ever so devolving / mutating Finder.
Take a look at this thread. I don't know any other way to achieve your goal.
– amiregelz – 2012-07-31T18:28:02.797