To the O.P,
I have been where you are now except we don't have hogs I'm my neck of the woods. Deer turkeys and predators are my main targets.
I have done the cz thing and they are a quality rifle but the high and heavy rings plus the magazine sticking out where your hand should be made me go get away from these rifles. Not sure how a Grendel would feed from the mag either.
I would say a Montana if you can afford it, a Ruger if you can't from your list of options.
I have both rifles in 223 and a lightweight 223 AI on a Remington action and have to say the kimber is my pick of the bunch, it's the lightest and still balances and handles really well.
Although I really like my 223 AI I wouldn't tear a good shooting 223 normal apart to punch it. Although you do gain some speed I think a lot of that is due to running it hotter. Also at typical hunting ranges the added energy and slightly flatter trajectory just don't make much difference in real world situations. Plus feeding of AI's can be an issue.
Pick a 223 you like and shoot the heck out of it. You will do well with it.
