Future proof in the sense that I know my next upgrade path will be an HDMI enabled Plasma, probably the Pioneer PDP504HDE.
By the time Blu-Ray becomes a viable option, or any of the other formats you mention, it will be time for an upgrade anyway
The current DVD format is now so well embedded into society, it will be very difficult for other formats to break into the mainstream, heck even the absolute potential of DVD's using pure digital connections hasn't been realised in the mainstream yet, and DVD has been around for years now.
I think it will be VERY difficult to persuade the general public to upgrade to another format when the majority of people already have their collections built up in the current DVD format. The majority of people (in the UK at least) have only taken up the DVD bandwagon in the last two years or so.
I think the newer future formats have a MUCH harder job than they think.
Picking the 668 was due to the HDMI output yes, but the rest of the features I feel are more than a match for the Denon duo, even if they are deemed to be slightly better in stereo music terms.
I love my 668

*shniff* and if a new super format comes into the mainstream before I upgrade to the HDMI enabled display, then so be it, thats life, and that means I will have a cracking sytem to migrate to the bedroom to make way for the new superformat


