Good work on both Peter!
Are you planning to take a trip to the snow this winter to get used to how the meter handles snow before you take it south in November?

As for the full-frame vs crop body experience, I use a 7D and a 5DmkII and despite there being a few differences in buttons, AF, etc I can pick up either and shoot without having to get my head around the difference (depending on the job I'm sometimes out there with both around my neck). The main area the sensor size makes a difference in is DOF-limited situations. With fast lenses it's sometimes scary how narrow the DOF can be!
With a D300 and D700 it shouldn't be too hard to flip between bodies as the need arises.