HMC is not worth the money. You have to purchase separate XLR unit, for 1K more you'll get new Canon XF100, with LCPM, IR night shooting- very important for wildlife night shots, same size as HMC40. GH1 is inferior as still camera compared to T2i or 7D. For a trip like that to produce sellable stills I doubt GH2 is much better.
thats $1.6k more for the xf100 $3300 to the hmc40 $1700
granted the xf100 would perform better (it better! costing 1.6k more)
if budget was of no concern xf100 is better choice than the hmc40
for the dslr, i think its either 60d or gh2. i dont think quality is a big factor here but the availability of lenses. canons have more and better lenses than gh2. but gh2 has the best form factor and features impo.