What should i do to my Runescape account!!!!!?

I have a mage range pure.. it has lvl 48 combat. 70 magic and 70 range. i do not want to level melee skills..because i do not enjoy them very much. i am a member if that helps. and i was wondering? would it be more helpful to level my defence to be a stronger pker? or level my prayer to 44? i want to keep my combat level as low as possible with the most effective results, but i also wish to wear dragonhide bodies. but im not sure if i should just foget levling defence and work on prayer so ican protect from melee, range, and magic,,ect.. Thanks!