gary996 said:These are the ones you want: Yongnuo YN-622
Phil V said:ETTL or Manual?
Is the 1d a classic or a later one?
Phil V said:If you want ETTL:
Pocketwizard Flex
Phottix Odin
The new Yongnuo YN622
Pixel Kings
The specs vary slightly and the price varies wildly - you'll need to come back with really specific requirements or do a lot of reading to make sure you get what you want.
(If I didn't have the PWs I'd get a set of the YN622s)
Blimey, I only wanted to have ago, not sure where to go from here lol