My personal advice...Leave well enough alone.
Using original objects has always worked for me in the past. I've created many maps with just that - original items and it seems they are accepted as decent maps by users. I've been tempted to add custom items in the past to try to enhance a map, but most users don't even look at them as they drive by. Until Oovee comes out with a "Top 100 (...or so)" custom objects to add to the Editor as an official upgrade, I will not include any custom ones from anyone.
I'm a bit old fashioned on my thinking on this subject and will, most likely, s