Another idea. Had I not already owned an AR and shotty I would have done this.
Consider bringing just some ammo to a local match, and try out some others stuff. I know that most of the people I shoot with would be more than happy to give you a go at their equipment, with factory ammo. Kind of like test driving cars, it would make sense. See what you like, and what you don't.
I shot matches for 2 years with basically a stock Bushmaster (added good trigger, and comp), then when I made the upgrade, it was with a full meal deal JP CTR-02. I knew at that point EXACTLY what I wanted, and am happy with it. Saved from buying several different guns, along the way.
Good luck, welcome, and let us know what you decide on!