Dont you have a SWB?
you have already cranked the front up?
Go get some 2.8 LWB springs and fit those to the rear.
33x12.50/15 will fit with out any other mods!!
Suvvey has these fitted to his LWB on 2.8 rims and has no catching at all and has no problems off road. He hasnt lifted the back at all and front is just cranked up.
Ive just fitted the 2.8 springs to the rear and boy what a difference, running on 31x11.50/15 full muds but intend to go to 33's next.
hth
forgot to mention Milners is probably your best bet for most parts, unless you got a local factors who might be as competetive.Mine is helpfull and prices arent that much different to milners.