When you think wheel upgrade think am I going to put big brakes on at a later date. 19's are easyer to put brakes behind eg dark agents.. mind you they make 20's in them now. Tyres are expensive if you want a load rated tyre.. I think I want to got for the 20's in a dark agent
It's helped by a diff bush, pedders can help you out with that. Also harder setting on your shocks will help, also try a rear sway bar too. Maybe craddle bushes too.