as an idea your tray backing it. you will lose sooo much weight from a RRC the doors weigh a shied load and the seats weigh a shead load too Was it 8 stone per door and somthing similar for the seats. All the body and tailgates will be removed I suspect you will end up with a motor weighing close to 1400-1500Kgs with bugger all weight over the back wheels depending on wionches etc.
X springs will get the correct rating for yo but it costs and its the absolute final thing after the motor is done to get weighted up. Anything HD will be too hard IMO, std weight will again be too hard for the rear front will be the opposite if you fit a winch. Fronts I'd say RED White from paddocks springs 175Lbs/inch +3 inch over std so you gain approx inch and half to 2 inches but its soft and nice when a winch is fitted to the front. I have red whites all round but I havd a Hard Top 90 with tools so the back is ok you need somthing lighter duty rear but tall.
Think Andrex: Very Soft and long!!!!!
Peronally as a cheap suspension lift go Plus 2 inch shocks and red white front and maybe a softer set rear and make sure nothing binds up propshafts and brake lines if you go dislocating then you need propahsfts although what you gain from extra droop I personally see as pointless unless your into posing.
+2 shocks,
Soft springs,
Weld up the diffs on the cheap offroad only Or save alot for axle difflocks and uprated shafts.