Hey, I read your new version of the wound ability and love it. I like the removal of the inflict wound because most monsters only appear in one combat (hence the players would not use it).
If you wan't to put a balanced inflict wound power in your campaign, I suggest making it a class power above level 6 (that way if it becomes permanent, the players are probably high enough level to afford the cure wound ritual).
For example, a rogue power you create could have the ability:
Special: If you have combat advantage, you may forgo sneak attack damage to inflict a wound of your choice. The recovery DC for this wound is 10 + 1/2 your level + Dex
This power is best suited to recurring NPCs. It does not suit the PCs as well because they usually fight each foe only once. Note that these wounds are more likely to become permanent than voluntary ones.
Edit: For balance and aesthetic reasons, wounds inflicted by powers do not daze, and are effective immediately.
The only suggestions I want to make are for convenient bookkeeping:
Gut wound. Maybe ongoing damage could be 2 for heroic wounds, 4 for paragon, 6 for epic?
Check DC: remembering the damage inflicted for each wound is tedious. I preferred your original system with DC based on level.