First shotgun: Remington 870, Weatherby PA-08 or Mossberg 500?

Hi gunnit,

First time, short time. I've heard good things about you folks so I figured I would ask some advice. My girlfriend is getting me my first shotgun for my birthday and I was instructed to choose between the three in the title. I've shot on perhaps 20 occasions, all clay pigeons/sporting clays. I will use the gun almost exclusively for this purpose. Also, I've noticed a few different models of each and I'm not sure which would be best for sporting clay type shooting. Any advice gunnit?