This one is for you wolf players out there and particulary for Monkey on the forums.
Do a search for Heroclix Fenris Wolf model. You now have the single best wolf model made to date. It is longer than Canis and stands about hair taller. Perfect for Thunderwolves.
Things to consider. Not a GW model obviously so in some tourneys that may be an issue. It does require a re-modleing of the legs so that a marine will sit on it right. And it only comes in 1 pose.
I landed 5 off of Ebay for around $20.00. I would post pictures but my camara is smarter than I am and I do not know how to post pics for crap.
Here is a link from BoLS that shows a good picture of it. I also heard that Chapterhouse Studio's may do some models of Thunderwolves.
http://www.lounge.belloflostsouls.net/showthread.php?p=37022&posted=1#post37022