pajero snorkels are like rocking horse poo unless you get a new one for £200+ on ebay.
long wheel base springs will fit a short wheel base and give 2" lift but they make the ride a bit harder. i've got a pair for £20.
you can wind the torsion bars up on the front easily to get some more lift .
some people remove the anti roll bars to get better articulation, removing the rear one doesn't affect road handling much but taking the front one off will make it wobble quite a bit on the road.
another cheap mod is a body lift but it don't help much off road, kits are on ebay for about £70.
the best mod you can do as anyone will tell you is big chunky tyres. again check on ebay for some.
and drive it like you stole it so it don't get a chance to get stuck.
oh and i don't know what rear axle you've got but i've got a spare limited slip diff axle for £50 or you could get one with a built in air locker again on ebay.