If you visit an auction site like GunBroker.com, you'll find hundreds of suitable rifles for sale. I've purchased numerous rifles and handguns on that site and haven't been disappointed yet. I'm quite partial to it, but I think the .25-06 may be the best caliber for the hunting you mentioned. The surging popularity of predator hunting has spawned articles in every hunting magazine out there and the .25-06 is always one of the top picks. Of course, it's a super deer cartridge, too.
I recently put together a predator rifle for my son - a .25-06 Model 700BDL with the engraved receiver offered in 1997-2001 in a Bell & Carlson Medalist stock (tan with black spiderwebbing), a older Leupold 3.5-10x Vari-X III A.O. scope and a bipod that can be used in the sitting position. It puts five 75-grain Hornady V-Max bullets into .556" at 100 yards. The load averages 3,714fps over my chronograph and since .25-06s are REAL flat shooters, being zeroed 1/2" high at 100 yards allows you to pretty much hold right on out past 300 yards.
Go on GunBroker, click on "rifles," "bolt action" and enter "700 25-06" (or whatever model and caliber you want) in the search field.
Ed