Too bad I can't "anonymously" post this...
I really don't like GTK-Gnutella. I prefer LimeWire over it, even though they are run on the same network protocol, I just like the GUI of Limey a bit more. I am going more and more CLI only, so my taste may change soon to a CLI based client.
Anyway, you might wanna try a few of the other's mentioned in this thread, they sound pretty decent. For me, for now, since I have to constantly reboot into winXP, I just use Grokster to get the "needed" files.