my minimum to tame is around 80/80 fire/physical resist with at least 900hp.
this is about a 1kk dragon, i will also sometimes tame ones that have a bit under that, but are very good in some other area, those are the 500k ones.
so it might have 800hp, but it will have like 85/85 with some 120 skills.
or if the 80/80 900hp has bad skills, like only gm wrestle or something, that will be 500k one as well.
then the higher ones it just depends what it has other than 80/80 900hp.
if they have the 900hp 80/80, plus some 120 skills, or 700 str, or good other resists, or over 80/80 (max is actually 85/90) - then they can go up into like the 8-50mil range
i can show ya what i've got and you can pick
they are worth what they are worth really, but i will do you a good deal cos i find a lot of good ones looking for great ones.
you only really need an 8-30 mil one for the tournaments
everything above the minimum level is perfectly good for pvm.
most people dont even need one that will deal decent damage.
personally i would take a high damage 800hp one over a tank for pvm, but i deal most of my damage with dragon and use luck suit, so consider what you will be using it for, and you will be able to get it strong in that area at least.