Scary,
I think the right answer is a MBP for the following reasons:
1. You have more flexibility in storage compared to the MBA. From the things you listed that you want to do, it seems likely you might need more space than the MBA max of 256 MB.
2. As you stated, portability maybe a necessity, so this requirement means iMac is not the optimal solution.
3. As for the MBA, you can purchase a separate monitor later down the road. If you need to move to another location, you can always sell the monitor to curb your travel weight and buy a new, maybe upgraded, monitor once you settle down again.
Good luck with your degree, it sounds like you have an interesting option in being able to go abroad.
I think the right answer is a MBP for the following reasons:
1. You have more flexibility in storage compared to the MBA. From the things you listed that you want to do, it seems likely you might need more space than the MBA max of 256 MB.
2. As you stated, portability maybe a necessity, so this requirement means iMac is not the optimal solution.
3. As for the MBA, you can purchase a separate monitor later down the road. If you need to move to another location, you can always sell the monitor to curb your travel weight and buy a new, maybe upgraded, monitor once you settle down again.
Good luck with your degree, it sounds like you have an interesting option in being able to go abroad.