I think it's not a problem if the price looks strange in dollars, since they'll see that it was a nice round number in euros. Obviously, with the exchange rate changing all the time, there would be no way of keeping them all looking "nice", unless you spent several hours each day editing every listing!!
Don't feel pressured into lowering your prices - the chances are that the person buying the item knows the true value too, so won't mind paying the price you feel is appropriate.
Best wishes,
Bea