Crab would be interesting, but I agree with the others.
For what I wish (and what could be likely) my vote goes to the Wolfhound.
***SPOILERS***
It was designed specifically to fight Panthers. It's a new design, along with the Hatchetman, but it is in production and starting to be spread around. Also, it's durability will be very helpfull during the invasion.
To top it all off, one of the most important encounters of the Clan invasion happened when a Wolfhoud went up against an unknown design that shared the body, missile pods, and legs of a Catapult, along with the arms of a Marauder. It was a Wolfhound that first sent back data on that mech which had its computer rapidly cycling between MAD- and CAT-.... Hence MadCat.
You need the Wolfhound for Phelan to get captured.
Edited by Clark, 20 December 2011 - 11:01 PM.