This is a great thread idea...
My current favorite five:
1. Buzzz
2. Reaper
3. Aviar P&A
4. Wraith
5. Beast
I will often use a different putter, Wizard or Warlock, Rhyno maybe (because of flexibility or weather), but I always go back to one of my first discs...the Aviar. The Sidewinder is sort of a "5.a." for me because of its versatility. If I mold down then the Sidewinder would likely be in the bag instead of the Beast.
There have been times that I would use some other molds; then the Wraith or Beast would get supplanted, but I always end up putting them back in the bag. The Valkryrie was in the top 5 but has fallen all the way out of the bag right now. It may be because my disc is broken in such a way that it flies differently. I should try a new disc.