Pajero BS III or IV

Hi, I am thinking for getting a 2nd vehicle after I sold my Innova mid this year and my final 3 shortlists were Endeavour, Fortuner & Pajero. After going through various reviews & after test driving them - I think I will go for Pajero. I will explain later, why I chose Pajero over Fortuner & Endeavour. And now - I need your advice; Pajero BS III or IV? Few comparision; Pajero BS IV: Power: 108 PS Ex-showroom cost: INR 21,78,668 Pajero BS III: Power: 118 PS Ex-showroom cost: INR 21,22,934 Technically - I am getting a powerful vehicle for 55K cheaper and the dealer promises me to get the new vehicle (say Jan 2012) since they are still producing BS III for non-metro's. And - I guess this can be clearly verified by VIN # & Form 22. Pls. note that the car will be registered in a non-metro RTO - so no legal issues as well. And dealer says that all the features & specifications in both are exactly same, hence - no inferior product. So - here is the advice I am looking for; 1) Am I over looking something here? 2) Is BS IV car more efficient (though it produces less emissions)? 3) While speaking - I was also told about power upgrade to 150 PS using a kit. I am not sure if such a huge increase is possible with a kit alone (no engine remapping). Any thoughts & is it advisable?

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