I'd have to side with the thoughts on brush guns being about short easy handling guns, rather than shooting through bushes. You want something that is easily maneuverable, doesn't hang up every time you turn, every time you try to pull up to take a shot in cover. Look for a carbine, or youth model in whatever caliber/action you choose.
If all you're looking for is the occasional shoot a deer standing behind a bush, pretty much any caliber will do that... IF he's standing right behind the bush. If he's standing 10 yards or more behind said bush, then you get into the deflection issues everyone is warning you about.
Personally, I wouldn't opt for a 30-30 in bolt, although given the new leverevolution ammunition, it might prove very interesting. I'm sort of a purist when it comes to some guns, and the 30-30 lever action is just something that was meant to be, in my book. If I'm carrying it in brush, I don't want a scope on it either. And personally, I prefer the Marlin 336 action for several reasons, over the model 94. Have owned both, know they both have their strong points and weaknesses.
If you're dead set on bolt in 30-30, and I'm assuming looking for accuracy, see if you can find a Remington 788.
http://www.gunbroker.com/Auction/ViewItem.aspx?Item=451699100#PIC