Being in the process of assembling one, I believe the best and most cost-effective printer (though not the simplest) is the one you build for yourself. See the RepRap project and printer models at www.reprap.org. If you want a ready-to-print model, I've heard many good things about Makerbot.
As far as scanners go, I do not have much experience. Most of the projects I have seen are either way too expensive or lack in detail. There is a project named FabScanner that looks promising, though (http://www.thingiverse.com/thing:14198).
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