I would say that Bunny's list a great starting point, and maybe add Red-Haired Boy. Beginning tabs for these tunes and many more may be found at:
http://www.bluegrassguitar.com/leadtabs.html
As others have said, you can find all kinds of material on youtube. I suggest going for the simple melody lines first, as the advanced leads can get you lost from the original tune in a hurry.
CK