I used a combination of sliced almonds and chopped pecans, but any nuts you love will work well here. For the dried fruits, I used a combination of raisins, golden raisins or sultanas, and dried cranberries. Again, any combination of fruits would be great in the mix. Adjust the sugar according to your preference, I found that the dried fruits made it plenty sweet for our tastes.
Roasting the nuts for 10 minutes in a 350 degree oven will bring out a warm, nuttiness in the oatmeal. It isn't required, but it does create a special flavor that isn't there with raw nuts alone. I have made this both with and without roasting the nuts and we happily eat it either way.