It depends how you want to shoot. I'd say 20 or 25 magnification for the high side, so for 500-1000m range, of course the 14x would work, but its nice to see a bit smaller scale at distance.
I had a 3-12 power and it was great for clarity (heavy 300WM) but lacking in power, had a less expensive 6-24 power and it was much better for that.
If you plan to bush hunt with it as well, 4-20 (maybe a burris) or 4-24 range would be my recommendation. The USO 8x mag scopes (8x range aka 2.5-20x etc), as well as the 8x range NF scopes are interesting additions, but well over your specified budget. There are a few deals on the EE, a bushnell 3.5-21 DMR would be great if you found a deal on the EE.
Also, there may be something by Athlon that fits the bill, Go Big Tactical on here sells there stuff, as does mystic precision I believe.