In reply to contrariousjim:
Stay away from anything with that 1.6 diesel PSA engine (Peugeot/Citroen - it's in the Ford Focus too). Replacing the turbo (£800 - £2000 depending on how soon you want to have to do it again) and DPF unit (£1000) is not fun.
A quick google for '1.6HDi turbo failure' should scare you off sufficiently.
The DPF unit is actually a service requirement at around 75k, which they (unsurprisingly) stay pretty quiet about.
The 1.9D is dog slow, as mentioned above, but a simpler and hence more reliable engine.
My 2.0HDi is going pretty well at 122k right now. Could do with a new EGR valve, but that not big bucks compared to the 1.6 issues.
I'd go for the 2.0HDi every time.