Thinking about buying a pathfinder

first post to first off, hi everyone

im thinking about trading in my reasonably reliable Kia
Sedona 06 plate for a 09 or 10 plate Pathfinder. Im
currently looking between garages for the best price.

is there anything i should be aware off before taking the
plunge and buying one.
reliability needs to be key for us, we have 2 small
children and not alot in the way of spare cash to be
throwing at it, i dont want to be trading in a fairly
reliable car with its foyboyle and niggles (with only
37,000 on it) to land myself with a car requiring
expensive parts etc.

my main concerns are

brake system : how does the braking system fare, is the
pathfinder heavy on brakes shoes, disks etc.how much do
brake pads / disks cost? im forever replacing mine on the
Kia. ive replaced the kia ones so far in 5 years, about 4
times at least, maybe 5. including drums and callipers.
not to mention tyres, i think im in double figure with
tyres (remember , 37,000 on the clock from new!)shocking
really

MPG : im going to be doing 100 mile round trip
(motorway/main rd mix : 70:30 split) to work now from
tomorrow. i did 20 miles per day until then. Will the
pathfinder cost be a huge amount. the Kia is around £98
to fill, i get around 345 miles out of it.


anything else i need to be aware of that potentially goes
wrong?

thanks