It all depends on what kind of staking you want to do. Whatever the case, keep the 1 pray obviously. I would do one of these options.
Barrows pure (probably torags, c shield, and whip):
70 att
70 def
50-60 str
Tank ranger (wear torags and use x bow):
90-99 range
70-80 def
low other stats
Perhaps even a 1 def, str pure for no armor staking
Pure mages can do well, but people are usually very hesitant to fight mages.
Whatever stats you get, you will usually have the advantage with 1 pray.