10k-15k HP, a Sprint, and a gun with 1k AP total will have you set for a good while. You won't be the most hax Lion, but you'll definitely do some decent damage.
@Infernal: 4 DP per level is worthless. DP on Lions in general is worthless since we have no shield anyways and hats typically have lower DP unless it's a unique or Alti. I can maybe see the 1 HV every four levels as useful, but HV hits a cap of usefulness.