Hi oranges, and thanks for starting and maintaining this thread.
I'm in a similar situation as you, having had a third degree tear with DD1 (induction, very long second stage, ventouse) that turned nasty (developed fissure on top of repair that gave me over a year of pain and required more surgery). I am now eight months pg with DD2 and always thought I would have to have an elective CS. However, the perineal experts at my local hospital (who are supposed to be the best in the country) have checked me over and declared me good as new, and have recommended a vaginal delivery. After the shock of this, I have really got my head round it, and am planning to go ahead with their recommendation.
What swung it for me was having a long chat with the obstetrician who explained the risk and relative risks of it having happened in the first place and this time round, and he also pointed out that if there was any concern at all they would just book me in for the CS - after all, it would be much the easier option for them than the amount of maintenance I required after last time! And he also said that they wouldn't have spent so much time and effort investigating how well I had healed and what would be the best option for me if they were just going to recommend what they wanted anyway!
My feeling is that this time can't be as bad as last time. Plus by signing up for an elective CS, I am committing myself to a post-CS recovery with all that entails (no driving or lifting etc), which I would find difficult as my DH works very long hours, I have a 3yo and like to be as independent as possible. By going down the natural route, I feel I am at least giving myself a chance of a quicker recovery (and last time, despite everything, I was doing really well until the fissure happened). There is also a part of me that wants and needs to correct the horrific memory of last time, and this feels a better way of attempting to do that for me.
I fully accept that having committed this all to MN, I will have an awful time this time and rue my decision to not push for an elective CS!
Good luck with whatever you decide and I hope you find your appointment with the consultant constructive. If not, ask to see someone else - the doctor I saw last time made a massive difference to how I felt about it all, by dint of taking the time to answer all my questions and not making me feel that I was being silly.