200 ft and in: Medium or Firm S Gateway Wizard. If I need a hyzer I'll throw my newest one, if I need an anhyzer I'll throw the most beat-to-hell one I've got.
300 ft and in: DX Innova Roc. New one for hyzer, beat in one for long straight shots, beat-to-hell one for turnovers.
Over 300 ft and wide open: Champ or DX Innova Valkyrie. The DX is longer, but the Champ gives that kooky skip!
Over 300 ft and tight: X Discraft Cyclone. I get better overall distance from a Valk, but the Cyclone is a lot more accurate.
Turnover roller: Beat-to-hell Cyclone.
Overstable driver, forehand disc, forehand roller, thumber, grenade, and pretty much all trick shots: DX Innova Banshee.
In the Winter when it gets really windy, I'll add a Millennium Q Sentinel to the Rocs for a more overstable mid-range and I replace the Cyclones with DX Innova Gazelles. That give me some discs that are just a little beefier in the wind.
That's about as complicated as I let it get these days.