Mosins are great, dirt cheap bolt actions. You will not break it. Get the Carbine if you want something that will scare the bejesus out of yourself, anyone around you, the animal you're pointing it at, people a mile away, etc. Get the 91/30 if you want a solid, dependable, reasonably accurate rifle.
Mine was my choice for deer season this year, and I had no qualms about beating the hell out of it, wrapping it in camo mesh, dragging it through mud - and knew it would get the job done. The ammo is interesting if you're reloading, as it will often take the same calibre bullet (not round, but bullet!) as the .303 British - I reload for both so it cuts down those costs. The bayonet is a novelty, but a big, long pointy one. I use mine as a letter opener and cat-jabber.
Theyre decent rifles, and a hell of a lot of fun. Not parting with mine anytime soon. The big issue is ammo, but marstar has some decent stuff, if you're willing to buy a case of ~800rds. For less, reloading is the way to go, though you can find commercial loads sometimes, depending on where you are.