Some of this advice has already been given, but I had a recording job last night before I could reply.
Anyway, if I was starting from scratch this is what I’d take:
Recorder: Sound Devices 722 or 744T. These recorders have proven their ruggedness in all types of climates. They are small and reasonably light weight, with dual media and power. The 702 is a fine recorder, but if I was a couple of weeks deep in the bush, I’d pay for the dual media 722. I don’t know how the DR680 will hold up under extreme conditions but personally I would not take the chance. You don’t need all those channels for the type of expedition you are describing; you are not making a studio recording, you are trying to make an accurate recording. If you must have more than 2 channels, get the 744T. Sell the DR680 and buy a 722. Leave the V3 home, or sell it to finance the 722. Buy a couple of fresh batteries for the 722, and use them a couple of times before you leave. Get or make an external battery for the 722. Perhaps a battery sled that would take 8 or 10 AAs; that way you could buy extra batteries when you need them.
Mics: I’ll repeat the Sennheiser MKH8020 suggestion. Small, light, neutral, relatively immune to humidity, and expensive. Since they are omnis, they will not have proximity effect are will be less susceptible to wind noise. (If only Sennheiser made an MHK8030 figure-8 mic, you could have a sweet little MS rig.) Leave the VP88 home. Take the 416 since it might be useful. Even though I seem to have an opinion about everything, I don’t have one about the wireless lavs and a DSM-6S/H. I could see where the binaural pair might be good to have.
Make sure all your cables are in good shape. I don’t think I’d make or buy new ones, but don’t use really old cables either. Pick cables that have been used a couple of times and inspect them carefully before you go. Take several smallish (2, 4 or 8 gig) CF cards that you have already used a couple of times. Rotate the cards through the recorder so you don’t have everything on a couple of cards. Don’t record at a sample rate above 48k unless you are going there to record bats. Record everything you can; more than you think you should.
Yes, my suggestions may be beyond your budget, but that’s what I’d do.