If marantz then i would of thought the UD7007 would most likely be today's equivalent which retails in the UK for £630 or around $988. it does have more than the 6400 but it's little brother, UD5007 which is £380 or around $600, does not have multichannel or digital audio outputs but do have 2 ch audio outputs.
Other brands possibilities are
OPPO BDP 103 - £500
Denon 3313UD - £500. As with the UD5007, no multichannel or digital audio outputs but do have 2 ch audio outputs
Pioneer LX55 which is pretty similar to the UD5007 and denon - no multichannel or digital audio outputs but do have 2 ch audio outputs