Heavier front suspension would help if you choose to go with big front bumper and winch. If you do not plan on those, there is no reason for stiffer front springs.
The nice thing about chassis cabs is that they do not change much from year to year. I would take the risk in ordering the current SuperHitch Magnum and make any adjustments if needed for fit. It will be much harder to retrofit a strong enough receiver later that can handle an extension.
I keep forgetting that the fancier packages give and take options. Sometimes what I want is only available in my tightwad trim level...