I have 2in Ironman lift kit with foam cell shocks already installed by the previous owner so I cant compare it with stock suspension.
Prado 3.4/4.0 is a good option but too heavy on fuel, consider 5 in city and 7 on motorway.
Try LC100 2003+ with 1HD-FTE and you will be surprised by its fuel average, it gives 7-8 in city and 10-11 on motorway.
I have got a 97 LC80 with 1HD-FT aka multi-valve diesel engine and I am getting 8.5+ km/l in city and 10 @ 100km/h, its a manual.
Welcome to the club once you get addicted to SUVs you cant stay without it.
Kept a Civic 9th gen for almost one year after selling my 98 Surf but I have to revert back to SUVs.