I've been pricing new tires for my truck and decided to put together a spreadsheet showing my results. See image below or attached PDF for all the info and details I dug-up during my search.

P.S. I went with the Toyo Proxes STII.

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That's a nice chart, but there are bigger sizes available, that will fit, including the Cooper Zeon LTZ in 285x60x18, which gives great traction and carries all the extra weight of the LR3 easily.

 

I run the Nexen Roadian on my LR3 and have had them on there 2 years and they are not even half worn and its driven ever day, I have the toyo proxies stII on my range rover sport and they didnt even last a year, for my money its the nexen. I talked to my tire guy on saturday and if you have the 22 inch range rover sport wheels, tires are even cheaper, than the 18's and 19's, just throwing my 2 cents out there, everyone has a preference