I've obtained various models (with various polycounts), and I want to add them to the game as an inanimate creature.

Any one of these:

http://www.3dcadbrowser.com/download.aspx?3dmodel=80746

http://www.turbosquid.com/Search/3D-Models/dalek?sort_column=A5&sort_order=asc

What would be a reasonable polycount for a creature of this nature?

My main problem is getting it into a format that the game can understand, as I have no idea how to do this - once it's in the CS I'll have a vague idea of what I'm doing. Also, I'm not sure if I should set it up as a creature or NPC. It's sole attack would be some kind of target spell.

Just to clarify, I'm not looking for someone to do this for me, rather a nudge in the right direction and someone who may be willing to help me out if I go wrong.

Any help would be greatly appreciated.