Bolt actions? Not really a brand, but an action style: Mauser-based.
Herter's, Rugers, and mil-surp Mausers dominate my rifle collection.
Lever action? Marlins. No dirt on the Winchester '94, but I just like Marlins more.
Semi-auto? Haven't dabbled in them enough to figure out a fave.
Shotguns? Remington 700 (before the bankruptcy).
Handguns? Glocks and Springfield XDM's.