Before you go with BearShare you might want to give Gnotella and Gnucleus a try too.

Gnotella main fault is it's tendency to slow down when sharing many files - otherwise it's pretty good. Still no resume from alternate hosts - though the normal resume works better than LimeWire.

Gnucleus has improved quite a bit recently (the guy puts out a new version almost weekly). It groups like LimeWire and *does* re-search and restart from different hosts quite well. It's also very fast. One problem is its seems to have a problem downloading from some (but not all) firewalled hosts (those needing a push). Often it'll fail on hosts Gnotella has no problem with.