Members

Also referred to as members, or the awkward abbreviation "P2P" that more commonly stands for "peer to peer".

Members pay US$5 per month, and the pay-to-play membership brings:
 * Extra skills such as Agility, Fletching, Farming, Herblore, Slayer and Thieving
 * Higher capabilities possible in many other skills
 * Use of several transportation systems
 * Additional map areas
 * Sub-games and other features, such as Duelling under set rules and risk
 * Better items, such as Dragon weapons and armour
 * More bank space, though there are many more items available
 * Many more quests, including quite a few with experience level boosts
 * Member's servers

If you want the best value for money, and don't intend to remain a member for more than a month or two, then get your free-to-play skill levels up to the point where you can benefit from members features, such as crafting better runes and lay in a stock of items you will need, such as logs, bars and feathers for fletching arrows - you would have to start with Bronze arrows, so it would be the first time you've needed bronze bars for a long time.