ok... here you go...
captain beefheart is strange, yet great. i would go for one of his later albums (78-80) first, as they are more... easy? not as difficult anyway.
primal scream... great band. get screamadelica, vanishing point and xtrmntr. i would suggest vanishing point as the best place to start. if new order were evil...
velvet underground--get their first three albums. now. don't bother with lou reed until you know this stuff. don't buy a best of vu... it is a useless endevour and their albums are cheap anyway.
doves--get their second album... don't remember the name. there goes the fear is a wondrous single and the rest of the album is tip-top too.
roxy music--their first four or five albums and avalon are all amazing. i especially like their first. the second has some great stuff on it too. avalon will make any woman want to get in the sack. useful!
donna summer--difficult to compile, difficult to choose albums as she didn't always have quality control. she has great songs, but finding a complete selection that doesnt include crap is hard... someone needs to buy up all her stuff and make a best of that really is a best of.
can--my oh my. all of their stuff up to 1975 is worth owning. best drummer the world has ever seen. (although not my favorite). if you like can, move on to faust. faust is even better.
the others i don't know so much about. but that's my two sense.