Extra Virgin is as cherryelm says a bit too expensive and specialised to use in your stir-fries.
I use Sesame oil for wok cooking. We all love the clean, delicate nutty flavour and despite what others may say it doesn't burn at high temperature - well, it hasn't yet in five years ;-)
It's traditional in some Greek villages to use young virgins to tread the olives and extract the juice.
Apparently the best juice is righ in the centre of the olive, and to get that out, they use an extra virgin in the treading process to get more weight on the olives.