Not sure if you have 16 or 18 inch wheels, but I am a fan of Bridgestone tires. Had them on my Discovery and they held up well and had great traction in all but the nastiest of mud.
Bridgestone A/T REVO II if they still make them, if not I am sure similar is available. I always replaced the spare at the same time so normally around $750 total. But if you have a good spare you could save $150ish.