If I already have a file with the same file length and a similar name as something on the network, there should be an option not to bother displaying it to me. I already have 1 copy, why would I want another? This would be especially helpful when searching for yet another version of that song you love by that band your crazy about, but you don't want to swim through all 300 results because you have them.

This could be done by file name, only, as an option, tho I prefer the file size method.