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The 840k and 900nc are almost identical, however the 900nc has some newer drivers with a better compression codec.
Thing is though, you can update the 840k with the 900nc firmware (which is what I did). So you've basically got a 900nc at the cost of an 840k (cheaper), and also the 840k is easier to put the 1.25" adapter onto (it just screws in).
Talk to matt at telescopes-astronomy, he sells the ToUcam with the 1.25" adapter, and an IR blocking filter which is a good idea too. Just don't get the blue-cast glass IR filters. Get the baader or edmund scientific, for around $120.
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