I'll go with the new D700
bear in mind that the higher end the camera , the more expensive the accessories
if you need to get extra batteries or replace batteries or charger and other stuff, they are more expensive. Repairs and parts are also more expensive when they break down
Not forgetting when you pay a premium, you get more premium options also.
EN-EL4a lasts easily >2000 shots per battery with mild chimping. 2 EN-EL4s (note, it's the EL4 and not EL4
a) lasted me for two weeks without recharging on a trip overseas, tho' yes I did bring the charger along.
Spare chargers are a bit tad hard to get though, as now the flagship bodies comes with dual battery chargers instead of the single charger previously. However, my D2X's charger has been going strong since 2005, despite going on many long trips overseas. Not to really worry about this.
MC-20/36, ML-3 remote cables are across the hundreds and single digit bodies.
Shutter replacement is estimated the same at $500 thereabouts.
Seriously, not all the parts are that expensive as worried.
As for the lack of inbuilt flash, at ISO6400, I managed a WA of f/8 at night with sufficient shutter speed at 1/60.
The only matter is more on the weight as well as the built in grip.