Dif Juz and related things

Hello,
I'm new here so please be very nice to me. I'm also just exiting 
pimply youthhood so excuse anything that could be considered 
ignorance in the following message.

I have been interested in and collecting tracks by the Cocteau Twins 
over the past 2 years (and I really like that stuff) due to a 
recommendation from a friend. He also recommended Dif Juz at the time 
and I've just managed to find an EP called Vibrating Air which is 
very good. I want to know what Dif Juz stuff I should look out for (I 
understand they didn't release much). Or should I just try to buy 
every release?

Are there any other artists/bands I should check out in a similar 
vein? I also like The Smiths (sometimes) if that helps you get an 
idea of what I'm into. I'm also interested in this Pop Ambient stuff 
coming out of the german minimal label Kompakt but what that's got to 
do with 4AD I have no idea...

I have some other questions: Where can I get a history/full discog of 
4AD? Why do people discuss Gus Gus/FSOL on here? I don't really like 
that stuff too much... I'll add some context another time...

Take care,
Nick:)