Just have a few multiples of your main discs. I have 3 Rocs, 4 Eagles, and 3 Wraiths in the bag. I don't worry about multiples for many other molds. As Mashnut said, try to get discs you know you like when you place at tournaments and such.
hydra roc eagle pd wraith
6 discs returned
7 players introduced to the sport
10 discs given to new players