I have spoken to a couple of LEO's in Arizona and they have confirmed that RD is correct. First they will ask for you to submit to a field sobriety test. Refuse it completely. When the officer asks why you are refusing the test, you say because it is your right to refuse. They WILL drag you down to the station and ask you to submit to a blood test. Even the cops say that they threaten to take your blood, but they can not do it without a warrant. If they tell the judge that the only thing is the smell of alcohol, there is not enough to do it and they will cut you loose.
If they do obtain a warrant, give the blood. There is a couple of reasons for this, first it is going to take the time for them to get a search warrant. So, from the time you have had your initial run in with the LEO, it is going to be at a minimum of 1 hour, probably more, from your first stop. You can play this easily. If you are just slightly over, a good attorney could easily argue that you had your last drink right before you were driving and it took 1 hour to fully be absorbed into your blood stream. At the time of your driving, you were below the .08 BAC and it was only the last hour your BAC has actually increased. Try to proove that you are wrong. If you WERE really boarder line and on the way down, the 1 hour might put you below the .08 BAC mark. Say you only had 1 drink all night. Too many questions for them really to push the point.
If you do refuse everything I hear that the fine is $750.00. Like RD said, it is much better not to drink and drive AT ALL, but if you are going to have a drink or two, have some kid drive you.