Advice on buying a transit tipper!!

[mattyb]

Im looking at buying a transit tipper for around £3000.
I've been looking at the year 2000 - 2002 models all of which have between 100 -170 thousand miles on the clock.
Obviously I'd like as least mileage as possible but are there any problems with the engines that have that sort of mileage on? also what sort of things should I be looking for with regards to problems? any advice would be much appreciated!