How many points have you got already? You don't say how much over the limit you were, you may not be offered a course. More information will get you a better answer but the last it'll cost you is £200, maybe 3 points, maybe 6 points. Maybe more.
But re-reading your comment, if they've offered a course for the first offence you ought to take it.You won't get another course for at least 3 years and you can't choose which offence to put them with.