Tuffmudder, the 4bt is a great choice, also the Isuzu, its going to be about availability for you, I also love the 6bt but have to agree with everyone here, unless your gold plated its going to eventually cost you a lot of bucks...my trouble is I live here in the Phils now and the choices here are vastly different than the stuff in the states...I had an Isuzu Trooper here and loved it, cant remember the engine though...just put a 15bf in my 40 here and its a beast...but almost impossible to find there I bet....good luck on your search, btw where did you end up putting this tread?