A few more things. You don't necessarily need to lift it to put in bigger tires. Fender trimming, bump stops, flat fenders, and other things will let you put on up to 35's without a lift.
Also, lower back spacing will indeed let your tires stick out further, just be careful with that. Make sure they don't stick out too far because A) it put more strain on your axles since you're moving the weight of the tire/ wheel further from its intended stress point B) some states have laws against tries sticking out past the fender flairs.
If you need a hand or have any more questions feel free to ask.