I have a 85ps 2006 T5. it’s comfy, but def feels bigger than the T4 – not a problem unless you spend all your time on tiny country roads.
T4 is excellent though, and the T5s ain’t cheap. T4 doesn’t seem to notice the mileage so you should be fine with a van with a 100k on the clock.
get a larger engine, my van is ok on motorways, but really I’d rather something a bit on the more powerful side. 104ps will be fine, the 130 better, the 174, fab!
VW vans are ace