First off Welcome
second off leave now while you still have money in your back account , this longrange thing is addictive as crack the next thing you know your calling one of the great smiths here to build you a new long range hammer.
Your current rifle is a good base to start with , the caliber has all the power you need to shoot deer to 1000yds and paper a good bit further. Depending on the accuracy you can get with factory ammo (i'm assuming your not reloading as you mentioned the Hornady ammo) will make the biggest differance in your long range ability. Typicaly with any factory gun I get I take it down clean it realy well , bed the action and float the barrel , check the crown to make sure their no boogers on it , work the trigger over to smooth it up and adjust it so its lighter with less creep and overtravel than what the the manufacture's lawyers allow. That sounds like alot but its a good place to start to make sure the gun is close to where it needs to be to get started.
as for your scope choices , I'm not framiliar with either of those scopes but I've had good luck with Nikon. The scope is no place to pinch pennies , a cheap scope with poor focus and paralex issues will make a good gun shoot like a dog after all if you can't see it you can't hit it. a 10 power scope will get you on paper pretty well at 1000yds but a little more is always nice and like I mentioned a scope is an adjustable paralex set will make a big differance.
Next thing I'd invest in is a reloading setup , it doesn't have to be a big expensive combo but again investing a little more money will help you out in the long run. The Rockchucker kit from RCBS is a good buy and it has everything you need except dies and a few measuring tools and will load some great ammo. But if it takes a while to get your reloading supplies going then their are some good factory ammo loads out their.
If your shooting factory loads get a few differant boxes to see what your gun is gonna like the best.