I can't narrow it to one only, but Driver a must is my ESP avenger SS this is the disc where I really started to throw big distances. Mid-range would be my Ace Race 2008 now the Nebula, it is predictable gets good distance and doesn't skip, a must for setting up for my putts. Putter since I have so many, I would have to go with my FLX Challenger, it feels good in the hand and is very accurate. I can put with confidence with it.
Pro Rhyno. I LOVE that disc. I usually have 5 in my bag...yes...five. 2 are putters (only cause i want 2 when i practice. 1 is actually one of the yellow molds and I've weathered it nice to be flippy. 1 is a fairly new one for straight shots and some hyzers. 1...my only champion one, is more domey so it's really overstable and I throw it for spike hyzers and windy shots. Yes, I love the Rhyno