Dont EVER plead guilty unless you want maximum fines, max points, and the record to match.
That ticket is completely invalid. Passing on the right doest apply at ALL to your situation on a 2 lane highway. That cop is a fucking idiot because he doesnt even know the laws he is citing. You should be able to get the entire ticket thrown out.
A passing Moving Violation is 3 points and Im sure it will be close to $200