for pking both f2p/p2p, id say initiate pure! but: before you go 20 def, make sure you have gotten all str bonuses at p2p... addy gloves, addy defender, climbing boots, etc. then when ur bored of p2p, u can go f2p and own there, becouse 20 def+mith id more then enough for f2p. will stopp allmost as much as full rune, and you can hit alot more dmg... BUT: a initiate has prayer, you have to think about that also. so if you dont want prayer, i suggest stay 10 def.