questions for my lift....

[2010_5thgen]

Im working on getting everything together for my lift.
#1.... I have the green keys.... question is, How much can i lift the truck with these without sacrificing the ride quality?
#2.... Next issue. Im going to order Rancho shocks S5000. The ones i was going to get are part # RS5289 for the front and RS5297 for the rear. These are for a 4" lift. Is this ok even if I only lift the truck 2-3"?
#3....I want to do spring spacers in the rear. depending how much i can lift the front with the green keys, but i was thinking 2" in the rear and 3" up front. so who makes a good spring spacer in a 2"?
#4....Would you recommend me getting the Rancho steering stabilizer? part # RS5407. I figure its a good idea when i get larger tires, but I thought it might help with the slight lift.