No, you won't have to sacrifice a stat, in fact, getting all 3 up will increase your hp(that's good). You want as much hp as you possibly can. In regards to defence and prayer, they should stay at one if you want to remain pure. This is a definate especially in f2p. The extra combat lvls will hinder you. A range 2h k0 is where you first use your range to get their hp down, and depending on your str and max hit, pull out your 2h and "k0" them for the rest of their hp. Hope I helped! jav