Buzzard,
Why do you need a backhoe? The reason why I ask this is that you state you are a weekend warrior, so how much are you going to be using the backhoe? Are you going to dig up a lot of trees, use it for a business or dig numerous trenches? If not, why spend the money for it. I would forgo the backhoe and just get the 3320, then then rent an mini excavator when you need it. Or you could take the money you would invest in a backhoe and get a 3520 or 4120 for that matter. You will then have the power, size, quick attach loader and lift capacity, and be done with it. It is your money, so you need to make the decision, but I would go with the 3320, 3520 or 4120 and forget the backhoe. Also I would not be afraid of a turbo. John Deere has been using turbos in tractors since the sixties so it is a proven technology for tractors.