#2 on Backroads. We've interacted a little with them in France on our self-guided trips and they seem decent. I think if you opt to go with a tour company you will pay a lot more than self-guided, but you will have a very efficiently planned trip which should take you to just the right places, no routefinding and no wasted time on logistics. So you trade money for time by using a tour company, imho, optimizing the time you are in Europe. Also lose spontaneity and serendipity . . . but lower risk.