I broke down and paid for "GoodReader".
It does not have text search, but is otherwise a decent application which is passable until I find something better.
It uses the original document in an "as is" form, so whatever font the document is using, will be displayed as far as I can tell.
Also if your pdf is split into chapter files (which many text books are!), they will not work with this program as they do with windows based pdf readers (ie. when you click a link from the contents page, it does not open the chapter file so that you can view the contents of the new file).
I am still keen to get a better program, and as I say, willing to pay if there is at least some idication that it will work for what I want, better thank "good"reader...
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