Being somewhat of a newb, sticking to Innova, if you could carry any three discs my suggestion would be;
Driver: Leopard or Eagle
Mid-Range: Panther or Skeeter
Putter: Whatever feels comfortable in your hand, but would definatly say a putter with a shallower lip
Stay away from Distance Drivers until you can control your drives. When you gain the arm strength and proper mechanics, you will gain most with a Distance Driver(which at that point I would recommend a Valkyrie to start). Mid-Ranges and Putters are more of a personal preference than anything. Adam hits it on the head with the Putter. Stick to a single putter, no matter what it is. When you start carrying a bag with 14 discs in it, 9-10 will be Distance/Fairway Drivers, 3-4 will be mids, and you'll probably still be carrying 1 putter.