I bought one of those Passat, 130ps sport model, 54plate. 85k for 2900 and that was after a month of looking. So probably you will be looking at ones with over 100k on the clock.
That said mine runs a treat, real nice place to be. Changed the filters, oil and timing belt when I got it and it is around 45mpg average on winter tyres. Sits around 2k revs at 70mph and between 2500 and 3k revs pulls very nicely. Fits a cube of logs in the boot too.
-Bad points, quite low to get in and out of if they’re older. Not great ground clearance either for rougher track. I just had to put the alloys in to get sandblasted as the paint has gone and tyres were slowly losing pressure. Also had to strip the drivers door to replace the window regulator as they are prone to rusting on the bottom corner, cheap but time consuming repair.
I’d buy it again, it does what it does well.