Upload & Sell: Off
A guy came into work (REI) and he was doing the JMT in a few months. Now I want to do it, lol.
Honestly it would be super hard for me to ditch my camera. I could make do with one lens if need be.
As for the D3/D700, the D700 will be more than adequate. ONLY option I see that would make the D3 a better option is the dual card slot, but is it worth $500 more? That is up to you to answer. The D700 is fairly weather sealed, and I haven't had any problems with it thus far. I shot with a 1Ds before and that thing went through hell - I am sure it was glad when I sold her . The D700 feels just as solid as the 1Ds.
You can always add a rain fly if needbe when/if shooting in the rain. I personally don't use them - but after my F5 went down after using it in light rain (and it could be a total coincidence - which I am sure it was - I mean a light rain?), it kind of has me thinking, lol.