vdub fan here too

2003 is a mk1 caddy. came in petrol and diesel forms
diesel's were 1.6D 1.9 SDI and 1.9TDI
if you gonna get a mk1 caddy make sure its the TDI, the SDI was a rite slug of a van.
but the TDI was old technology and its not very efficient, the sdi on the other hand is pretty good on fuel.
depend what u wont most really. economy or pulling power!
great german build quality and will run for ever if serviced regularly
hope this helps
ian