No matter what route you go, you will need a sleeping pad. People often skip here, but that’s a big no-no. Because no matter how good a sleeping bag you get, the part you lay down on will be compressed and offer no insulation. So, you need a sleeping pad, or you will freeze.
There are three types of pads: foam, inflatable, and self-inflatable. I will only focus one the first two, as the self-inflatable pads are too heavy for the back country in my mind. Foam are often cheap, and they are a no-nonsense option. But they don’t pack up small, and they don’t have the highest comfort. Lastly, they don’t have a high R-value, which means that they don’t keep the cold away that well.