Prosecutors have wide discretion whether or not to prosecute. If you blew under the legal limit (on the intoxylizer at the station, NOT the PBT at the side of the road) the prosecutor might charge you out with a lesser offense, or even none at all. And there is really nothing you can do to change the way the prosecutor will treat your charge.
But you should talk with an attorney before taking a plea bargain. Most people aren't aware that there are serious civil ramifications to the crime of DUI/DWI. Basically, there is an "implied consent" process administratively at work that may affect your driving privileges without you even knowing about it. This means that any plea you take, even to a lesser charge, could result in an "implied consent positive test" on your driving record that could stick for the rest of your life, or sneak up on you when/if you have a future violation.