My personnal suggestion :

Step 1 )
The model is not what will make your game good, begin to make a great looking level and gameplay even by using A8 low poly characters : they have the animations you need !
So begin your game with them


Setp 2 )
Once you will achieve some gameplay and level people find good :
Some studios povide custom services :
you ask for some specific or general model and they can make it specially for you, with the polycount you need , with the animations you wishes !
You could check that way also !

Or just check Dexsoft, you 'll find what you need i think
Dexsoft characters