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Okay, I'll bite.
The 92kHz is the sample rate of the audio processor, as the DJM-800 has digital inputs (and outputs, IIRC). The mixing and the effects are all done digitally.
The DJM-400 doesn't have digital inputs, but the input is sampled digitally and mixed as so.
If you only need 2 channels and want to play with some effects, I would recommend the 400. Sure, the 800 is nice and all, but as you said, it's probably out of your price range and you won't utilize all 4 channels.
I'd like to mention that I have a 4-channel mixer (Ecler Nuo4) and only 2 CDJs, but I have two outputs from my computer routed through the other two channels, which are hooked up to a stereo system.
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