it really depends on what your going for, personally i like my pures for melee set as 99 str 40 or 60 att (or enough attack for w/e item u want... no more then what is needed) and 40 range (for some armor that won't increase ur combat level by much) also 31 prayer if u feel u need that extra boost besides super sets to get ur str to owning people
my rangers to be 99 range,.... that is it
and my mage pures as a 94 mage and minimum stats for dt that way you can barrage people like hell
for all of this i personally think you should have ATLEAST a 50 constitution or ur dead,
but it really depends on how u feel about your account i have seen alot of people with not pures kick alot of butt in the wild because they know how to throw their account around and perform a ton of combos,
in general ur account is a great start in my opinion, you just need to find the way you want to pk and then stick to it, like personally i like the dds and the d bow, hybrids and zerkers are pretty good also, and summoning tanks are great (only problem is they are a BIG pain to make)