I love my .280AI and am hoping to get my first moose with it this year.
I think 270, 280, 7mm, .30-06 or many others would be good. Moose are killed in Alaska with a .243, though most people think that is a bit small. You could use your .25-06.
Bergara would be good, Weatherby Vanguard, Tikka, several good options. You could look for a nicer used gun too. Browning X-bolt, Ruger, lots of good options.
Then get a nice scope - you don't need anything crazy, something that is good for a few hundred yards.