I have a Weaver Classic V16 on a lil 243 that I'm very happy with. These can be gotten for around $300.
Nikon Buckmaster I believe in 6-18 is worth looking at.
Sightron I or II is excellent Scopes with a no haggle Warranty.
Vortex Crossfires are very good.
Bushnell 3200 are excellent but still overpriced for being discontinued.
Surprisingly a Simmons Aetec or Whitetail Classic 5-20x50 are outstanding values when found.
Nikon Scopes are good Scopes. The Buckmaster line starts giving the much better Glass over the ProStaff, but the ProStaff still compares well with the Leupold Rifleman Scopes which is Leupold's lowest Models.
Also look at some Redfield Revolution Scopes. They're assembled by Leupold and are very good.