Tyres for my Discovery 4

[1hardwork]

Hi,

Need a new set of 255/50/20 tyres for my Disco. Currently have Pirelli Scorpions on there. Is there anything harder wearing? Was offered a new set of Pirellis for £350 that came off a Range Rover but the profile was 55 whereas my Disco ones are 50. Has anyone put 55's on a Disco 4?

Thanks