topping is awesome if done right.
the guy who said that topping stops all new growth has no idea/experience with topping obviously.
I like to top small (say 3 nodes) and then again on the topped pair when they branch (giving 4 main branches) and i end up with about 30-40 different branches all about the same height.
I use sativa dominant strains and it turns them from a christmas tree into a big fat bush, which is what i want in my 6 foot ceiling.
I have a max of 4 plants under a 600w HPS, even then its tough to fit them all in.
Its true that topping gives different results to different strains, play with yours and find out how it works as suggested
ps the guy suggesting LST seems to have LST mixed up with FIM. FIM is pinching, LST is tying down with string/rope/fishing line.