Have you thought about a Kia Sportage?
Ive just bought one and am very impressed with the build quality and price!
Its a 2 litre diesel (138bhp) 4X4, that comes with a 0.5m wading depth (good for slips) . It averages 32mpg around town, and can tow 1600kg (braked)
You can visit kias website ( www.kia.co.uk
)for full specs but it has the following, It also handles like a normal car when not towing.
6 speed gear box
ESP + 4x4 lock mode
Fold flat rear seats
opening rear window
elec sunroof & front / rear elec windows & mirrors
Full leather interior inc heated seats
The XS (top model) costs around £17k alot less that other 4x4s