What UT Hunter stated is fact...bring chains for all four wheels and if you have a winch, bring a good sized danforth style boat anchor. You can dig the anchor in the dirt and then winch yourself out if you get stuck. Kinda of hard to get the anchor out after you are done, but beats walking back to the highway for help.
I love the area and think the hunting is fantastic. A realistic goal is exactly what you said, a big heavy horned buck that tickles your fancy.
If you have deep snow, wander all around the south side (not too far up Union Pass as the deer will be down from the high country. The further west you go you will see less people, thus better odds of a big buck.
If you have little or no snow, think about spending a night out way up high and hunting above timberline. If it is still warm, be aware that there are lots of grizzlies, especially towards the northwest.
Also, if the judge in MT doesn't close the wolf season, carry a wolf tag and shoot straight, the deer's life you save might be your trophy.
Also, if you have time, spend the early part of the season in there as well. The year I hunted it, I was told the big buck winner took his on opening day, and the year before the winner took his early. But if you don't have the whole season to hunt, hunt the last part of the season.
Enjoy a very hard to draw tag.