king crimson and captain beefheart

mu missus has got me looking for various king crimson and captain beefheart, mostly

court
3 pair
starless
I cant remember the full titles

And

clearspot
unconditionaly guaranteed
bluejeans

Looking around on ebay there seems to be LOTS of different pressings, especially with the king crimson stuff.
What ones are best? Some go for lots, so maybe the best question is, are there any pressings to avoid?

Thanx.