I have an LT35 mwb which is the same as a sprinter from the screen back. Good workhorse and holds and drives a load better than a trany as we have one as well.
Dont get me wrong, there is nothing wrong with the tranny, its just the lt is better in my view
Both the Sprinter and LT are well known for clocking up big miles with ease so dont let that put you of.
On the sprinter, they do run hot and can very easily cook them selves if not looked after
The LT, different engine (5 pot) but check the Cambelt has been done
Both do 50 miles to a tenner in real time
An x plate for 1500 is a good buy if its as good as you say so i would say get it bought already and dont let your mates know you got it as they will all have something that needs moving