Respected Tsikoteers!

I am planning to buy and imported Pajero Japan Version. My budget is 500K.

Kindly advise me as to the things I should consider when choosing one.

Primarily, I'd like to know what is the difference between Fieldmaster type and Exceed? Also, Why are prices of imported pajero so inconsistent that you can find a 98 model and a 2004 model almost of the same price??! I have also noticed that subic pajeros are much cheaper..

I am a newbie in the car kingdom.. kindly help.

Thanks!