Fox is right, leave it be.
If you are determined however, MikeHiow is the only person talking any sense in this thread. OP isn't trying to turn it into a track car FFS, he does not need a full suspension package. A set of progressive springs will reduce bodyroll without compromising ride too much.
Uprated ARBs will have a similar effect, but despite the name, ARBs are more about tuning a car's handling balance than eliminating bodyroll. You use ARB stiffness to move a car's neutral point between oversteer and understeer. It's overkill for what the OP is trying to achieve.
In summary: If you must do something, just fit a set of uprated progressive springs.