FWIW, since you use the truck for snow plowing I would definitely recommend a spacer kit and keep the stock springs.
Something like the BDS kit with Icon shocks (click the Configure button). Would be the best setup as the Icons are clearcoated and perform extremely well.
BDS 2 Inch Front Spacer Kit - 2008 Superduty 4wd - 2008-2009 F250/F350 SRW 4wd - Truck Toyz Store
A dual stabilizer is also a nice upgrade along with an adjustable trac bar, but not "necessary" to complete the install.