Can you still achieve relatively high interest rates in foreign currencies once you've shifted your 'home' currency over there?
Worldwide interest rates on USD deposits are VERY LOW. By a margin of around 1/2% or less. Normally in NZ, foreign currency accounts generate a slightly higher rate of interest than their native country deposit rates for callable accounts.
$10,000 IMO is not a lot of $ in today's term. I would have no issues bringing that much in cash for a specific purchase or even sitting on an airplane travelling over the ocean.