warning, have never used any of these outfitters, as we have our own places to hunt etc.

but dont bother looking nothing big, only 120 class deer in Montana....

http://www.worldclassoutdoors.com/montanahighcountry.htm
http://www.worldclassoutdoors.com/kootenaioutfitters.htm
http://www.anchorpoutfitters.com/Photo%20Gallery.html
http://www.bigbuckoutfitters.net/

Here is the Montana outfitters site...you can select regions, units, types of critters etc. to hunt...

http://www.montanaoutfitters.org/index.php?page=search


but in all seriousness, to the IL monster whitey post...in Montana, we rarely spend time chasing whitetails, as they are not worth the time when you can spend just as much time/energy/effort and get a Bull Elk....or a Monster Muley...

So, whiteys are really under hunted in most areas in Montana, which indeed makes it a great place to hunt them...Our family place, we have atelast 3 bucks over 160 one approaching 180 on the property...so the big dogs are definitely here...but we dont hunt them much...