Suspensions are my passion. Doing your plan will be a major improvement! The one important up-grade I don't see listed that I would say is needed is a good set of shock absorbers (dampers) correctly valved for the new springs. The obvious choice, given where you live, would be Koni yellows (sports, single adjustable), but have them custom valved to match your spring rates.
After that, a new pair of rear springs (DON'T by mono-leafs!) and rear shocks will finish the suspension upgrades.