I really enjoyed this series from Image, and later, Devil's Due.
But it was cancelled in the middle of a story arc! Drat!
It had great artwork, too!
For a good self-contained story that was actually completed, your best bet would be the original Image miniseries, issues #0 to #5.
The other 11 issues were done by Devil's Due, but, like I said above, the series was cancelled in the middle of the story arc. I would not recommend them.
So I say, go with the original six!