this may help as basically the prado is the same as the hilux, I tested at least 10 prados before finally buying one, they ranged from 2003-2009 V6 and diesel, I loved the power and performance of the V6 espiecally with the 5 speed auto, but ended up with the 2006 prado 3.0 turbo diesel manual, the auto 4 speed diesel is pathetic, but for the best re-sale, performance and cost effictive servicing i picked the last model before the d4d as the injectors need to be replcaed every 100,000klm at a cost of $4k and you only loose about 7-10kw with the old reliable mechanical injection(about $80 for an injector) Iam getting about 1500-1700klm per tank with the 3.0td and a mate has the V6 prado 6 speed manual, getting about 1100-1300klm per tank(180 litre standard tanks)
You really must test drive them all first i think and see if power is worth it.