Request for Suggestion on Which Hero to Upgrade

Looking for Suggestions....
66K HB currently... building towards 100K... but then what to do with it...
You can choose up to 3 options...

Qty 1 - LVL 140 Upgrade (100K ea)
--> Spirit Mage - 5/9 - 3/5 Berserk
--> Thunder God - 5/9 - 3/5 Revite
--> Pumpkin Duke - 5/9 - 5/5 Heavy Blow
--> Minotaur Cheiftan - 5/9 - 3/5 Revite
--> Druid - 4/9 - 4/5 Revive
-
Qty 2 - LVL 120 Upgrade (50k ea)
--> Grizzly Reaper - 5/9 - 4/5 Heavy Blow
--> Cupid - 5/9 - 4/5 Heavy Blow
--> Snowzilla - 4/9 - 5/5 Revite
--> Succubus - 3/9 - 3/5 Berserk
--> AtlantiCore - 4/9 - 4/5 Revive
--> Paladin - 3/9 - 5/5 Heavy Blow
-
Qty 2 - LVL 100 Upgrade (30k ea) with 40k left over
--> Champion - 3/9 - 5/5 Berserk
--> Ninja - 3/9 - 5/5 Blade Shell

For Reference in Making Suggestions:

Boss Battle - Partial Perma Stun - Usually up to a minute... best so far is 2.5 minutes
--> Thunder God - 5/9 - 3/5 Revite
--> Pumpkin Duke - 5/9 - 5/5 Heavy Blow
--> Champion - 3/9 - 5/5 Berserk
--> Grizzly Reaper - 5/9 - 4/5 Heavy Blow
--> Cupid - 5/9 - 4/5 Heavy Blow
- Thinking of tossing in either Paladin or Snowzilla once I get the 6th base (20 days)

HBM - G - No Garrison
--> Thunder God - 5/9 - 3/5 Revite
--> Cupid - 5/9 - 4/5 Heavy Blow
--> Spirit Mage - 5/9 - 3/5 Berserk
--> Minotaur Cheiftan - 5/9 - 3/5 Revite
--> Druid - 4/9 - 4/5 Revive
- Thinking of tossing in either Pumpkin Duke or Reaper once I get the 6th base (20 days)

Arena
--> Thunder God - 5/9 - 3/5 Revite
--> Cupid - 5/9 - 4/5 Heavy Blow
--> Spirit Mage - 5/9 - 3/5 Berserk
--> Minotaur Cheiftan - 5/9 - 3/5 Revite
--> Pumpkin Duke - 5/9 - 5/5 Heavy Blow
--> Succubus - 3/9 - 3/5 Berserk

Thanks,

MrTasselhof