re: How long should I wait to get a qb if I miss out on a top 3 qb.

Tough to predict the rounds as every draft is different. If you can get Stafford a few rounds after the big 3, may be worth it. Otherwise, I would wait until at least 8-10 QBs are off the board.

To me, there is little difference between Luck, Ryan, Foles, RG3, Cam, Brady, Romo, Cutler, Kaep, Wilson, or Rivers. Throw in the big 3 + Stafford, and that gives me 15 QBs to choose from. I can wait until 10 are gone, then grab 2 of those available in the next 2 rounds and play match-ups all year.

Perhaps you only like 7 of those listed above. In that case, I would wait until the big3 + Stafford and 4 others are off the board. You'll still likely get at least 1 of the ones you like.

Targeting a certain round for any position is amateurish IMO.