To begin with, WELCOME TO 24HRCF!!!
Among the rifle choices you mention, I would go with the .280 mountain rifle in .280 and load up the 7mm 140gr TSX's. This combo will do a great job for you as the 280 with a TSX 140 is every bit the equivalent of a 7 Mag shooting a 160-175gr lead core bullet. I hope you enjoy your new homeland. Good hunting, MARK