While I have only used the Real Esates for rentals, I have always like Jas H. Jas H was started and in Yarraville and has been a family business ever since. Whether they are the best for selling, I'm not sure though.
I think it's a personal decision though. I would tee up meetings if you;re thinking of selling and see which one rubs you the right way. Throw them a set of standard questions and benchmark them against the same criteria. That's if you're selling. if not, ignore me. :)