Hey folks, my wife and I are taking a trip across the pond in a few months to check out that other continent (we're from 'Murica). Our itinerary is starting in Rome, Italy from whence we spend some time exploring the country before heading up to meet some friends in northern Germany and kinda make our way from there down to Barcelona, Spain for our flight home. The question is transportation...some folks recommend the train, but I'm more in favor of renting a car. I hear, however, that one-way international rentals can be a big expense, but some countries are cheaper than others...Anyone out there have some knowledge or experience they'd consider bestowing on me? In gratitude I offer this ginormous desktop wallpaper of a lovely Lamborghini Miura:

European car rental advice?