Regarding purchasing overseas, i have just placed an order with Dixons Tax Free for a Canon 5d mark 2 with the 24-105mm. There price £2,260 (
http://www.dixonstaxfree.co.uk/index...pro_id=7001202) compared to about £2,200 from the US.
Ok slightly more, but its a UK camera and is under warranty in the UK. So if you going it may make sense.