A mage/range hybrid is my choice for pking.
Eolithist was one of those for a little bit, however I eventually leveled defense for armor and quests.
Eolithist is still a strong pker though (void pure) and has a max hit of 30 with mage and 27 with range (no prayer) at 74 combat.
As for HP, it's basically 1/3 of the xp you've gained from all combat stat training. This assumes that you DO IN FACT train all stats by combat alone.
You get 1.3 HP xp for every damage you deal.
You get 4.0 melee xp for every melee/range damage you deal.
You get a specific amount of xp + 2xp per damage for magics that you cast.
There are ways to train mage and range without raising hitpoints. This would be through non-damaging spells such as curses, nature rune spells, or teleports, or the use of a dwarf cannon (members).
In other words, it's completely possible to control your HP level, in case you wanted to keep it a certain level for a certain combat level.
Of course, making a range/mage pure requires money, so if you would rather not spend much, stick with a melee pure until you get some cash reserves.
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