What sort of mileage are you doing in it. If a low mileage get a big petrol - the values are comparitively low but they are so much better the diesel counterparts. Many can be LPG converted too.
V8 touaregs are silly cheap and very well engineered. Also I'm shocked you aren't considering discovery 3s - the best 4x4 on sale.
2008 E90 335i LCI M Sport / Manual / Black / Red Leather / Avon ZZ5 / VMR710
Mods: JB4 G5 ISO / Wedge Flash / BMS DCI / AR Design DPs / ETS FMIC / Meth Injection / Spec Stage 2+ Clutch / BMS OCC / Cool Carbon Brake Pads / RB PCV Valve / Forge DVs / M3 Control Arms / Bilstein B4s / Eibach Pro Springs / Eisenmann Race Exhaust
Wish List: LSD