currently i have a pure with the following stats that matter.

50 att , 81 str 80 range 13 prayer 77hp 79 magic .

should i keep training range till 90 and stay 50 attack or go to 60 attack.

or train str till 90 and keep range where it is and ethier go 60 att or keep 50

few things that worry me atm is my hp is high compared to others round me but they have extra str or range levels 

train att 60 str 99 rang 99 magic 99 and the hp doenst matter anymore

Its always personal preference depends on if u like G maul or Drag weps more.

depends on your style of pking. if you like the gmaul stick with 50 if you get tired of hitting 0-0 spec's then go to 60/75 atk... higher combat level usually means better loot