For those asking about plastic types, I've been throwing one of the swirly ESP machete's and found it to be the incredibly overstable disc I want it to be. It's an ugly gray/blue with a stupid looking machete guy, but the flight is awesome: hooks up hard, hooks up early, HUGE skips when thrown flat and low. The champion Firebirds I've had were less than FAF, and have been kicked out of the bag by the Machete. Currently pairing it with a Resistor, which I'm using for similar but shorter lines. For comparison, thrown at full power my Machete flies further than the Resistor. Between the two of them most of utility shots are covered. Probably thrown it about 75 times during rounds over the past few months, often in the woods, and have not seen much stability loss yet.
If it loses stability I've also got an unthrown first run Z and I'm currently another Z on the way. Sounds like they hook up hard, too, but I prefer the feel of ESP plastic. Very happy with the Machete and have used it to slice some strokes off my rounds.