Hey Anthony... how big do you want to go and how much money do you want to spend?
What's the reasoning behind the lift? How big of tires do you want to run? How heavy do you offroad (need the extra articulation?)?
There are a ton of different solutions, anywhere from just buying new springs & shocks such as Old Man Emu that will give you about a 2" lift, to piecing together a full kit with 3"+ springs, extended remote reservoir shocks, extended radius/trailing arms, 3-link system, etc..
1966 Series IIa "Olive"
2001 Discovery II
2006 LR3 HSE7
Past: 1994 Defender 90 #416, 2001 Discovery II