I would second the vortex pst, add the sightron siii lr and even go as far as to point out the Bushnell elite.
If you run a fixed power you simply have to compromise one way or the other. If your version of hunting is long range ambush you could get away with the higher power optics but it will limit any surprisingly close opportunities and then you have to worry about the mirage issue. I have done a fare amount with a fixed 10x and consider it a balanced compromise for all purpose and can easily do the job at long range. With your budget I would stick to the variable power optics.
A word on limited adjustment range: The new elite series are suppose to have 75moa but the old ones I use claim 50 and only really have 44.5 moa of adjustment. Before you run screaming. I wanted to say I run these on magnum rifles using efficient bullets and fairly conservative loads, Focused on accuracy and only concerned with velocity after load development is done. With the proper base and an appropriate shim I can run one to over 1200 and the other to 1380 yards, From 100 yard zeros. I have a de-facto zero stop three moa below my zero and they work great threw the whole range.
While these are not considered ideal parameters for a long range scope
, They work exceptionally well within those ranges, Takes a little extra effort to get them set up just right but it can easily be done. The vortex's 65moa on the other hand installed on a off the shelf 20moa base should give a theoretical 12.5 down margin and 52.5 moa of up adjustment. For 300 win mag 52.5 moa is allot and will reach way beyond your intended range of 1k.
The 100 or 120 moa scopes are great to have, require no cant in the base or rings but are completely unnecessary unless you plan on shooting extreme range.