Savage Axis .223 is another one to add to your list; accurate way beyond it's 'new' price and prolly cheaper than anything you'll find here used.
(especially if you catch the rebate on one now http://www.savagearms.com/promotions/
Trigger is easily 'tweakable' (for just few minutes of time) to make ideal.
.223 will reach out better than rimfires, more accurate at distance, & eliminate 'walk-offs' on bigger critters.
plus, WIDE RANGE of ammo ALWAYS available and fairly cheap.