Just a suggestion to give more information based on accepted answers.
- Total posts marked as the accepted answered
- Percentage of [total posts that are accepted answer] / [total non-question posts] * 100
- Badge for 50 accepted answers, 100, 500, 1000, etc... (Make it high enough that even Jon Skeet has something to shoot for)
- Not sure how the specialist badges works but could it weigh an answer as like +10 towards getting the badge vs just a post being +1? SO might already do this.