Japanese and English beading needles . . .

Fireline is my preferred thread and the one I recommend for my kits and patterns.
 My reason for using it is two fold:
1. it holds up to crystal beads better than anything else I've found
2. it's water resistant, which helps considerably improve longevity of finished work.
Generally speaking, I stick to a 6lb weight thread.

One-G is a nylon thread produced by Toho Company.  It's excellent for bead weaving and also a great thread to for stitching or embroidering on leather.  Bobbins contain 50 yards of thread.  Available in various colors.