They are all highly recommended PJ. Each of the magazine titles you list were produced by English kit car guru Peter Filby, with Alternative Cars being his original publication, which later moved into more prestigious specialist cars, leaving Kit Car to cover the more affordable self-build kit scene. Component Car was the later version of Kit Car, as Kit Car got taken over by a rival publisher (late 1980s from memory), and sadly the quality of that title then dropped drastically.
If you can't buy them all, then go for Alternatives cars from 1979-82, then Kit Car from 1982-90.
