If you want to extend rotor lifespan, look into cryo treatment... in general this should double or triple rotor life. Ideally you would find a local shop that does cryo treatment so you can buy your preferred brand (OE/dealer, OEM, Zimmerman, etc) and have those treated. There are also vendors who sell rotors that are already cryo-treated, but some vendors are reluctant to mention the brand, which may indicate they are cryo-treating cheap offshore rotors. Do some research before you buy pre-treated rotors. My LR4 doesn't need rotors yet but I plan to research this and find a good cryo'd rotor when I do have to replace them.
I can't help with pad recommendations, I'm still using the dusty OEM Ferodos for now. Just be careful with aftermarket pad selection, the temperature ranges may be different than stock which could be good or bad. Personally, pad lifespan is last on my list of concerns (second last is rotor life, third is dust) as top of my list is braking performance and pedal feel. Your preferences / needs may vary.
Be careful with ceramic pads, their main claim to fame is almost zero dust but can have some annoying side effects like squealing at low speeds and excess drag. I've experienced this on several other vehicles that I tried ceramics on and it took me years to figure it out. I'm not buying ceramics anymore.
Here's another forum thread with pad recommendations, I've used Porterfield R4-S in the past on other vehicles, they are medium dust and have good feel, but are quite expensive and I'm not sure how long they would last on the LR4:
http://www.landroverworld.org/threads/recommended-aftermarket-brake-pads.29144/
