The Madcat Timber Wolf from Mechassault on the original Xbox. I realised I haven't played it in a long time and I decided to give it a go, I do remember it being one of my favourite games on the big, black brick of love.
EDIT:Sorry, I meant Timber Wolf. It's pretty much the exact same design as the Madcat, but it has dual gauss rifles instead of the PPC, pulse lasers instead of the machine guns and the lighter Crossbow missiles instead of the heavier Javelin missiles. Plus it's slightly more well armored than the Madcat.
I often get those two confused.
Although, I wish I lied and said I had the Ragnarok. That thing is a fucking walking wall of death.