Rune is basically the best melee armour for non-members. For paying members, there are several better options. Also, you must adapt your combat type, armour, and weapons, to the weakness of whatever monster you want to kill. For example, if you want to do Slayer tasks (members only), or kill some other monster, it is best to look up its weakness, and choose one of the three combat types depending on this weakness. Also, adapt your armour to the type of attack the monster uses. For more details, read about the "combat triangle" on any online RuneScape guide, for example runescape.wikia.com.
Full Rune.
No, but you can purchase trimmed armor from members.
The next level would be rune armor.
Cyan/teal.
Rune armor is one of the best types of armor. It's light blue and looks similar to mithril but is a lot better. It requires a defense level of 40.
Mithril, possibly Rune (rune is a sort of greeny-blue)
You can't trim armor on RuneScape if someone tells you they can trim your armor don't give them your armor they are scammers
Members: granite armor Free players: rune armor
Full Rune is the current best melee Armour for free to play characters.
The best armor for free-players is Rune, God armor is the same the same thing, just painted with the colors of a God. For members, the best armor is Dragon, also the most expensive.
if u mean by highest as in money i think its guilded armor but that's off the top of my head. If you mean by best then rune armor
the best F2P armor is Rune (platebody, full helm and plate legs), Saradomin, Guthix, or Zammorak. all of these give the same boosts