Everyone gets to go their own way. The main thing is to get smaller rims and bigger, better offroad tires on these fine vehicles. For me, LR3 18"s, black, on a green LR4 has completely changed the look, and attitude, of the Beast.
My LR4 has much stronger braking power (stock) than my V8 HSE LR3 (stock). Going to the V6 LR3 brakes, adding a bunch of overlanding kit is asking for issues IMO. If you do go that route buy really really good V6 rotors/pads/stainless lines etc. Everything. Would be cool to see 17"s though.