My take on it.
The 90,s models will be the 2.9, wonderful engine with the gearstick on the floor and will go on forever if serviced properly. Proper auto gearbox torque converter.
After 2000 it will be the 2.7cdi or 2.2cdi with the gearstick now on the dash, the engines are not as good or reliable although are very strong, saying that some still do starship mileages. Still proper auto gearboxes on some but avoid the sprint shift would be my advice, prone to problems.
An old mechanic I worked with recently used to go around trade yards etc buying old sprinter vans, he had a bit of advice for any young apprentice mechanics he said.
''If the gearstick's on the floor, look around and buy some more but if the gearstick's on the dash, get outa there in a flash''
Have you looked around any Regent's, the La Strada model is a quality van. Excellent long lasting quality but choose wisely. Like any van in the world, if abused it will be a pile of trash.
I much prefer the Regent S rather than the L.
Most of the earlier ones 90's and 2000+ models I have seen are the Regent L, with the bed up in the roof, ok if your single, athletic and fit.
The Regent S has a rear transverse double, a much better layout in such a short van.
Have a look on mobile.de for choice although the exchange rate is rubbish at the minute