Here is an update,
I purchased the 540R and DVD89 and am quite happy with the results. The money I saved compared to buying the NAD went to upgrading my centre channel to the B&W LCR600 which better matches my current mains - B&W 2004. They are also in need of updating but that will have to wait until next year (looking at the B&W 603S3 among others).
I am very happy with the sound quality of the receiver and dvd player and am having fun with some of the multi-channel SACD material I have managed to find. Diana Krall's The girl in the Other Room regular cd sounded incredible - the SACD version both multi and 2 channel sounds simply magnificent. The DVD of her concert in paris also sounds fantastic in both Dolby 5.1 and DTS (I am trying hard to hear any distinction between the two. I really like the Dolby but sometimes I think I hear a more dynamic sound with the DTS. )
I have noticed some functionality issues from time to time but I knew this coming in and was prepared to sacrifice some functionality for what I heard as a better overall sound. My dealer was good about me auditioning both setups on a variety of speakers best approximating my room.
I had looked at the OPPO following some of the suggestions I had seen on the forum but the shipping, taxes and US exchange (though reduced lately) brought the price up to not that much less than what I managed to get the DVD89 for.
Setup for both units is easy enough although I agree with most people that the manuals leave something to be desired (esp. the DVD). Nothing crucial, just would like some clarifications on some things in the detailed setup. I will try contacting CA to see how they respond.
So overall I am quite satisfied. Thanks for the feedback!
Mitch