If you are considering being a rune pure, do not - i repeat, DO NOT train to 40 or even 45 defense for that matter. Often, noobs are under the impression, that pures TRAINED to 45 defense for the sake of the helmet. When in fact, the quest rewards for the required quests to be a successful rune pure all add up to the equivalent defense xp of the level 45. Search for a guide on becoming a rune pure to find out which quests these are. 2-3/10 for your current progress. All I can suggest is experimenting at the moment, find out what you want in your pure.