The High end bushnell and vortex are right there with NF
maybe not so much the bushy in glass but it's close: hard to beat for the money.
The ERS 3.5-20x50mm is honestly the best deal on a complete scope you can find. FFP, zero-stop, Locking Turrets, Mil/Mil, G2DMR reticle. Retails for 1999$ but can be found for 1700$ regularly and currently on amazon new for 1499$.
The Vortex Razor is a great optic as well right there with NF. I had a friend who swears by NF and saw a razor and now prefers it. Though it's very much preference at that mark. The razor is 2000$ new some can be found used for 1600$ range.
NF as Brian stated is great as well and GTG. Personally i'm not wild about their prices, that's just me though. If i'm going to pay around 2300$ for FFP, Zero-stop, Mil/Mil, etc. I'll probably get another USO. I own an SN-3 and i really love it.
That said the SHV is coming from nightforce and it will be around 1000$ SHV (shooter/hunter/varminter) it's going to be a very very great scope for the money, especially given NF's quality. It's 4.5-14x56, SFP, zero-stop, Mil/Mil or MOA/MOA.
http://nightforceoptics.com/shv/
When you say 300+ are we talking 600yds maximum or will you eventually stretch it to 1000yds?
Prairie dogs will stretch you past 600yds, so good optics with great tracking will be necessary. What's your desired budget?
This should help, note you don't have to spend 1000+ to do what your wanting to do, hell you don't have to spend 1000+ to just compete in matches if need be. That said i'm a firm believer in Zaks concept, the optic is every bit as important as the rifle.
http://demigodllc.com/articles/intro-long-range-rifle-scopes/