my favorite cast ons for socks?
3--twisted (aka norwegian, german, etc)
unless i am doing a toe up.. then i like:
3-simple (for socks that start on instep, and the toes is knit flat)
for a cuff down sock, ANY cast on will work, if the cast on is worked loosely, so [B]it has plenty of stretch.
[/B]i think the ones i listed are extra stretchy.. (and besides I like how they look!)
some knitters manage to make a cable cast on stretchy enough! (it wouldn't work for me!)
the best thing about KNITTING--is you have lots of choices.. and you can pick and chose details like cast on or decrease style (or in socks, heel style, and toes styles too, as well as direction!)
the BEST? YOU CHOSE!