What the heck, you don't really need another rifle, you already have one (30-30) you just have to carefully select and try ammo and make sure you use the biggest and toughest bullet on moose. Yeah, and stay within 100 yards for the moose kill.
But if you really want another rifle (you don't have to justify that to me :wink: ) go for something you are comfortable shooting, forget about the magnums. A 30-06 will kill anything that walks the face of the Earth (provided the appropriate bullet and that you know how to use it).
I would get a Tikka in 6.5 Swedish and use 160 gr. bullets. But that's just my obsession. I've seen a grizzly shot in Siberia with one of those (Norma ammo). Well, to put it in short, i've never tought an animal bigger than my car can be killed so quickly by a single bullet. I've shot the sixth largest boar ever shot in Russia (and they get big there, you know) with a 6.5 Swedish. One shot, from 120 meters, it died in 5 seconds. Now i know that it's the hunter, the shot placement, and the bullet that kill. Know thy game, know thy bullet power, and stay within limits, and you will be fine. All this magnumitis that you see now is just baloney. First the 30-30 was touted as non-plus ultra (that means "there is no better"), then the 30-40 Krag, then the 300 Savage, then the 30-06, and now it seems that you can't call yourself an honest hunter if it doesn't say "magnum" on your bossiness card.
Up-north in Canada, native people shoot and kill more moose than all the city folk with their magnums can ever dream off , and they use 30-30, 303 British and 30-06. In Africa, 6.5 MS, 7x57, and 30-06 have killed well and none complained about them. My grandfather used a 7x57 Rimmed in a single shot break open rifle, and he got a good number of red deer (the size of elk), boar, bear, and whatnot. He never wanted a bigger gun, but he knew when to shoot and when not to.
Learn where the heart is in your game, and shoot a bullet that will get there. As for choosing a rifle, get something that is comfortable to you, and that you can afford shooting. It takes practice, you already know that.