best nymph out there is the pheasant tail for sure. I have caught more fish on that fly than any other. I would have to say that the hares ear is a close second. I find myself using it a lot less these days though. Squirrel nymphs have gave me a lot of success.
Caddis larva imitations are killer. I use both a vinyl rib and ice dub version for mine.
I like to use stones a lot, and find that biot tail and antenna stones work better for me than rubber leg stones. The best materials to tie them from are hare, and squirrel in my opinion. I like to use these as my anchor flies.
honorable mention would be prince, copper john, green weenie, walts worm, frenchies, to name a few.
a lot of guys kill on midges, but I think I may have caught 2 or 3 fish on them, excluding one day on spring creek where a fishing buddy and I had a field day on zebra midges, and blue quills.