60 Attack, 73 Strength, 1 Defence, 1 Prayer. For HP, I would just let it raise as you train other stats, and sometimes use range to increase it a little. I would not increase it by too much at low level staking as you would not find many stakes.
The reason to get 73 strength is because it gives you 2 extra max hits, over someone who is 72 strength or under. This gives you a huge advantage if you stake someone that is under 72 strength, as your max dds spec is 16-16, whereas theirs is 14-14. I did this with my DDS pure staker and made quite a bit from this method =P, as most of the people staking there don't know this.