Used the...
Altura Pocket rocket for a while now... small and packable with its own stuff sack... but has flappy arms and short at the back.
DHB Minima s.... better cut than the pocket rocket, but thicker fabric, hence not as small when packed
have used both in really heavy rain... both are quite good.
BBB baseshield... cheap, packs really small but... cheap, so not great quality.... but cheap so good for stuffing in the saddle bag for emergency's
Northwave sid... little better than the BBB baseshield but like the BBB really only good as a light shower jacket
cant comment on other jackets as i haven't tried other packable jackets