Yes, you have choices!
PLATED: A served meal is very elegant but can also be very involved. Remember to identify the menu options in your invitations and have your guests indicate their selections in the response cards. It is very important to keep track of these selections because your caterer will need this information. Remember to mark the card with initials or names so that in case your guests don't fill out the name, you will know who they are! You will also need to create a system to help the servers know which meal to serve to what guests. The easiest way to do this is via color coded cards or accessories.
BUFFET: Buffets are great because they require little work from the bride, and sometimes they can be less expensive than a plated meal. However, this is not always the case as you need to offer guests multiple entree choices (caterers will need to over prepare for the additional need). Avoid cattle calling and arrange for staff to escort tables to the buffet stations for a less chaotic dining experience.
FAMILY STYLE: Cant decdid between plated or buffet? A family style meal is the best of both worlds. Your guests get to enjoy creating their own portions by serving themselves like a buffet yet get to stay seated like a plated meal. Beware of overcrowded tables with this choice - keep the centerpieces small and seat fewer guests at the table!
HOR D'OEUVRES ONLY: Tray passed or table-placed hor d'oeuvres are another great idea. However, they don't always save money! Talk to your caterer about options and price against a full meal choice. Be sur to orchestrate your evening so guests won't expect a full meal. This by the way is a perfect choice for an the post-ceremony luncheon!