Here's the thing - the player simply doesn't do 2:3 pulldown... so I would personally consider sending 1080i out to a 1080p display and let the display do the deinterlacing. The only other interlaced option you have is 480i - which really defeats the purpose of the player. 480p will look good, but again, why have a 1080p player... 720p - same problem as 1080p.
All in all, what they really need to do is figure out what the need to do (and charge) to put out a 720p/1080p player that does 2:3 pulldown.
Resolution - stunning (HD DVD will still be much better, but this is pretty cool)
Picture quality - will make you mad when you see jaggies everywhere...
HVD disc - WOW, if you have this player, go get some HVD discs.