You might want to do a search for threads containing a comparison of these two DVD players. There was quite a bit of commentary about them for use with an LT150 some time back. Most of the comments should apply to the AE100 as well.
I have nothing against the RP91, it is a great dvd player with a lot of features and will work very well with the AE. The RP56 has the Faroudja DCDi built-in and the RP91 has the Genesis processing chip. Since this is what the first poster was asking about and considering the price difference I would continue to recomend going with the RP56 if you are going to connect via component.
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