late 2003/2004 as you mentioned was the facelift year. Lots of upgrades on the 1.8. New dash, better lights, revised suspension options etc. Not 100% sure of all the TD4 engine upgrades, but am sure someone else can fill you in.
The facelift can IMHO be said to be a better vehicle, but not mind blowingly better.
As mentioned already. I wouldn't go there with the V6. Horrendous fuel consumption for not a lot extra power. There is a guy who got one for peanuts on here...and thats all well and good. But it wouldn't be on my list of must have hippos.
Thanks. So the younger models that ate selling for £2k more then the older models, but done same or more milage are simply dearer because of age?
ill try posting later or tomorrow the two examples I have found.