The Client FURI does what you ask, sort of. You can search for additional "Candiates" that it will use if the first one fails. It marks the ones in the search files with an * that you have selected to load.

Limewire groups "simulare" files into groups on the search tab and you can select down load any. If one starts and then fails the next one starts from the very begining of the file. (FURI does't, it Resumes automaticaly.)

I am running on a Mac so I can't ta;l about Bearshare or other PPC Clones.

Walt