I've got a Lexus RX400h (for your budget, you could get the newer 450h).
Hybrid, so £250 Road tax, basically a Toyota, so incredibly reliable (mine has 125k miles and still in great nick). Really comfy, lots of toys and pulls my 1600 kg caravan with no problem. The 3.5L engine is great (270bhp on mine, more in the 450h) but despite hybrid, economy isn't great - 30mpg average, 20mpg towing but it is a big, powerful car so I don't think that is too bad.
My mate has a Volvo XC90 (old one) and seems OK except has worse economy than mine.