A lot depends on your personal finances, a supra even non turbo isn't great on fuel and expect
to get around 20 mpg on local driving.
As for repairs it depends what you call expensive, for example i replaced all my suspension arms on my car
and the parts bill alone was more than the asking price for the car your looking at.
Get quotes from the specialist and online ins comps, it will vary massively dependent on your personal
circumstances. age, points, postcode, etc etc
Whatever you look at check it out thoroughly and ask lots of questions regarding parts that have been replaced
as these cars are now getting old and quite a lot will need a fair bit doing in the very near future unless its
already been done.
Search on here for the buying guide and the present owners posts etc and you'll get a better idea about the car
and the weak links on a mkiv, trust me they're good but they're not bullet proof as some will have you believe
Good luck