So I just found this out:

I can enchant with 10 points of frost damage, which will do 10 points of health damage and 10 points of stamina damage. The number of charges will say about 15, but for some reason I can do about 30 or so.

I can also enchant with 15 points of stamina damage, but the number of charges is 3! How is this comparable? lol

Now here is the funny part: The value of an iron dagger with frost damage goes to about 200, but with stamina damage, its about 600! You can do this with a petty soul, since the higher ones dont raise the value by much.
So all you have to do is just buy all the petty and lesser soul gems you can and trap souls in them and enchant any weapon you find with Drain Stamina. I was selling my daggers for about 250 to vendors (the value was about 650).