(more buses and timetables; sorry, I can't help it, I lead a boring life and find these subjects exciting)
update 2017: all vans from Victory Monument gone, they moved to Ekkamai, Mor Chit and Southern Bus Station.
4. From Northern or Southern Bus terminal
update 20sep2016: good articles here:
On the other hand, there are announcements to move all van stations from Victory Monument to other transport stations.