I use almost exclusively Uni-thread in 6/0 and 8/0, depending on fly size. Most of it is waxed, although I sort of prefer the unwaxed, but it is hard to get sometimes around here.

I use kevlar thread on glo bugs. Whatever I can find, again. My gudebrod was good but I am almost out of it, need to hunt down some more...

I have various spools of other stuff, use when I need to.