Being 100% honest, you aren't going to get a scope/rifle combo for $600 that is worth diddly squat on the scope side. All 3 rifles are okay beginner rifles for the most part. Add a couple hundred to your budget and you could come up with a reasonably good scope to put on your rifle. The only one of those 3 that I've seen even halfway good glass on them is the Savage 111 TH with Nikon glass. 3-9x40. It's fairly good glass I just don't particularly care for BDC rets myself.

The Savage 11 Trophy hunter, while having a good barreled action and trigger, is sunk into a pretty shoddy stock. It's cheap and functions okay in a pinch but it's not a stock I would want at all. Actually, all 3 of them, cheap Howa 1500 models too, have crappy tupperware stocks. Between the three choices in the cheapest models, I would go for the Savage as you can change things out easier when you want to improve your rifle at a later date..Get one of them and look to spend around 200 (sales going on all the time on good glass) for a decent scope. 99% of those scope/rifle package deals have complete crap scopes on them that I wouldn't trust to hold up on a .22 rim fire with the exception of the previously mentioned deal with Savage.

As far as your caliber/cartridge choices, I am in 100% agreement with 8mm/06...I've worked with 7mm.08 cartridges since WAY before 85 when Rem legitimized them. It's probably the best whitetail cartridge ever made and has plenty of power to take Elk as well. Taken a few with a couple of mine so yep that is from personal experience. And all that with moderate recoil that wont bring about snot bubbles from your kid every time he sits at the bench with it.