Lookin to buy a supra...

[suprra_girl]

well the 2jzge as far as i know is very reliable.... i really don't see how mileage relates to mods, what you really need to know is the history of the car.. was it looked after, oil changes, not overheated etc
easy way to tell... is the engine clean, no oil all around the bottom of it etc
does the radiator have any orange coloured water dried up on the top of it? or down the radiator etc.. this well tell you if the radiator cap has leaked also look at the water bottle to the radiator... does it have orange coloured water dried up all over it
if these two things check out fine then i would say the engine has been fine... if you want to really get into it you could have a compression check done on it by an outside mechanic to doubly check

the 2jzgte and 2jzge do have alot in common altho yes compression is different between the two (not sure what actual figures are) the na is 10:1 that i can verify

as far as mods go you could do the 1.5j which is a 2j block and 1j head, you will need to get extra oil feeds made to feed the turbo(s) and use the 2j rods but 1j pistons (if you can find some for cheap)
if not then just turbo the na.. drop the compression a bit

is there much of a difference in price between the turbo and non turbo?
it would make things easier on you if you just got a turbo mk4, depends how much money and time you want to spend on your car to which path you want to take
turbo comes with 6 speed, non turbo comes with w58 5 speed
i would run the 5 speed till you break it then get a 6 speed

good luck with ya car