I like lots of flavor to my chicken, and as with many other chefs, a high temp to start is the key for a crispy crust. I have a very simple olive oil, butter, parsley, salt and pepper rub and then lots of fruit and onions in the cavity which I feel really helps with the flavor. Rather than a rack, just use a couple of thick onion slices or a couple of celery ribs or carrots. It makes a natural rack and add tons of flavor to the drippings. Take advantage of what you have in your fridge. You can always use a traditional roasting rack if you want. But I think it is key to have it raised off the bottom of the pan.