Current v1.7 potion-related stuff. Healing duration is 6 seconds. Below stats are for a typical Tanky-Barb (expect to be within 20%, potions show smaller values for other classes):
Code:
Potion Reqlvl Heal Vendors
Minor 1 120 Akara
Light 10 220 Act2
Mid 25 320 Act3
Greater 40 480 Jamella
Super 55 700 Malah
Mega 70 900 Anya
Ultra 85 1100 Not Malah
Typical TankyBarb stats:
LVL 10 20 30 40 50 60 70 80 90 100
HP 200 400 700 900 1100 1300 1500 1700 1900 2100
Points of interest, justifications:
1) Boss fights are aiming towards no 1-hit KOs, so if you back off a boss the 6 seconds for healing should be reasonable. If you're not engaged in a fight, then you should heal faster than you are hurt. Personally, I'm not into boss fights that last longer than 10 minutes, so I don't think a pot-bomb (cube filled with pots) will be necessary outside of Hell difficulty.
2) There is easy access to reasonable amounts of ReplenishLife, which should make the healing feel faster. (the heal potions just apply X ReplenishLife over 6 seconds, so this is added to your base Replenish Life rather than replacing it). Your gear/skills could easily replenish at around the rate of 1/4 a healing potion for your level. This means that if you're short 1k HP and drink an UltraHeal, then you'd probably be at max HP after 4 seconds rather than 6.
3) Given that FindPotion seems wtf-incapable of finding anything above Super, I think the stats of the Super potion are high enough to make it worth finding end-game.
4) You can buy Minor in A1, Light in A2, Mid in A3, Greater in A4, and Supers in A5 norm. This decision was partly to make FPotion skill capable of getting better potions than what you can buy, and to make the potion drops of monsters seem nice by comparison.
5) All normal potion-vendors (except Malah) sell Ultra potions. This is the only way I've noticed for making these available in NM and Hell without a buy-1 limit. They're still level 85 to use, but if you want to buy one from norm Akara, then knock yourself out. In A5 only Anya sells both Mega and Ultra pots. Malah doesn't sell Ultras or Megas because I was being mean, and to make the SaveAnya quest seem nicer.