Many people use LCD projectors with HTPCs. So all of them are effectively using outboard scalers. As I have read all of the comments, the 'best' picture attainable is via 1:1 mapping to the projector from an HTPC (outboard processor).
I'm using a CS-1 on an AE100 (I know, I know), and am quite pleased. It's running on a custom 1:1 resolution. Less noise, better colors, and way easier setup than an HTPC (though this was before the Holo3D), and equivalent if not better deinterlacing. The CS-1, besides offering much better video quality over the projector's internal scaler/deinterlacer, also gives a lot of image sizing adjustment options that I like.
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