If there is an element/issue in controversy, then an atty is definitely advisable (such as bad stop, low BAC with rising BAC, etc., loss of CDL or teacher's license).
Unless you're going to trial, or stand a really good chance of negotiating a reduction (be realistic), then the Prosecutor will, normally, just offer a 'standard first' plea/sentence, whether there's an atty there or not.
OP, does he qualify for the PD ? They'll do as good a job as the $11,500. atty regarding the facts as stated (better - they know what they can negotiate for with that particular Prosecutor, and some Prosecutors will stick it to the 11,500 attorney when the Prosecutor has a slam-dunk case).
There's always the possibility of a breathalizer which was not calibrated correctly, but that's a very rare chance for a dismissal/reduction.