Vindi BP is best in slot Post-Torpor due to it's great stats and high resistances.
Once you get Torpor, Fungi Tunic is a lot less useful. Pre-Torpor, Fungi Tunic is something like 40% of your total HP Regen, which is why it is so awesome for leveling. With Torpor, you are regenerating at 300HP a tick, so Fungi Tunic becomes something like 5% of your total HP regen. At that point the Resistances/AC/HP from Vindi BP is probably going to be saving you more when fighting hard content than the Fungi Tunic regeneration.
If you want the STA clickie you do not need to get the HoT BP, you can settle for Thurg or Kael, whichever is cheaper. I personally wouldn't get HoT BP unless you want it for the fashion. It is much more expensive than the Thurg BP if you are just using it for the clickie, and stat wise you would always pick Vindi BP over HoT BP. I have the Thurg BP bagged for the STA clickie.
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