I've entered only 2 shooting match events in my life with shotgun. One was sporting clays, the other skeet. I got 1st place with one and 2nd with the other using a Winchester 1200. I love it so much, I'd love to get another. I say this not to impress, but to impress upon you that no matter which gun you use, if you shoot it alot, you'll get comfortable with it. Next shotgun I'm getting is a Remington 870 because I've heard nothing but good about it. I suspect if you get one, you'll be shooting awesome with it in no time!
I highly suggest since it's your first, that no matter what happens in the future, always keep it and never sell or trade it. Not many people have their first guns and it's sentimental. Nice to hold a gun many years down the road looking back many years back down the road and reflect the times you had with it.
iSnipe