Bro for you I think 70 series light duty would do the job (though it lacks the softop part) so in case of 70 series you have following options:
- 70 series with 2lt or 22r would be in your budget but they are underpowered for me atleast.
- 70 series with 1kz will be hard to find in your budget
Bro, 1kz is an excellent highly complicated 4 cylinder diesel engine with huge low end torque @2000rpm with the help of its turbo spooling from almost start (though you can't get even close to the torque figures quoted by you from a 1kz running on diesel available in Pakistan while you'll get almost the same power figures from a 2f (210ftlb or 284NM @1800rpm)plus its not only torque its low end torque or else you'll be frying clutch plates) . The intercooled version as far as i know never came in 70 series it was made available for surf/4runner. Moreover, the kpl figures quoted by you seems too vague to me as people (like nomanff@pw and a cousin of mine) here are getting around 6-7kpl from 2f and 1kz gives around the same. 10kpl for 1kz seems quite impossible for me atleast.
And would you please stop comparing 1kz (indeed a legendary engine) with 2f (legend for what its made for) they are of different leagues and of different production years (1kz vs 1fz would be somehow of same era). 1kz is a lot more complicated as compared 2f the more the complications the more chances are there for an old vehicle to breakdown (vehciles having 1kz are not new they are here for almost 2 decades). Further as far as i have experienced 6 cylinders as compared 4 cylinders are mostly reliable as in case of a problem for a cylinder (like spark or fuel) you'll get less effected. (and yes im a bit biased about the f series engines )
In offroad applications people mostly dont brag about torque or hp as an offroad or a reliable touring machine is not the vehicle having powerfull engine its a complete package from engine (reliable and power), suspension, differentails, gearbox etc. A single part betrays you and your stuck in the middle of no where.
With best regards.