I used the wizard card while in Germany, no foreign currency conversion fees at all. Interest rate not too bad either.
Other thing is to withdraw from you savings account and not credit card. It should only be a flat fee not a percentage, and use eftpos and its a bit cheaper still.
As for travellers cheques, you may be paying a commission for 1% or so when you buy them unless you have gold credit card (some banks offer no commission when you have one)
There is a credit union a mate in Isle of Man set up an account with that charged no fees for international transactions, I think it was Queensland Credit union, might check with him later