If I had it to do all over again from age 17, I would find a superb stainless steel rifle with a fit and feel that suits me. I would select on of the following calibers, in order of preference: 6.5x55, 7mm-08, 7x57. All have relatively mild recoil and can handle everything from varmints up to moose with authority. IMHO the "magnum" craze is a lot of hullabaloo. The standard calibers shooting the right loads and premium bullets are quite effective without all the recoil and muzzle blast. If you are going after dangerous game, such as the larger N. American bears or African game, then that is a different story.
Also, don't forget quality optics, with a nitrogen-filled tubed, multi-coated high-quality lenses, and rugged construction; a rifle is only as good as its aiming mechanism.
Boy, I envy your pocketbook and opportunity. Enjoy your selection process! :grin: