The fork buffet
Somewhere in between a formal, silver-service dinner, and a finger buffet is a fork buffet. This basically allows guests to help themselves to a variety of hot and/or cold food from a buffet, and then sit at a formal table setting to eat. It's a great idea -- allowing guests to have more of a decision in what they eat, but still retaining the formality of beautifully set tables and a seating plan.
Instead of a single buffet area, how about having various 'food stalls'? Each of these could serve a different course, or a different type of food. If you're a fan of Pan Asian food, for example, you might have an Indian food stall, a Japanese food stall, a Thai food stall...
The finger buffet
With a finger buffet, guests don't require cutlery and are free to mingle and eat at the same time. The food might include things like tasty canapés, delicate sandwiches, individual pastries and dips. This is a less expensive option but there are certain things to consider. If you are having a relatively long day, it's not ideal to expect people to stand for the duration. Some people, especially more elderly guests, will want to sit while they eat, regardless of whether the food requires cutlery or not. A well-organised reception with a finger buffet should still offer some seating around tables for those who wish to rest their legs!
A slightly more glamorous way of wording this type of reception is to call it a cocktail and canapé party! If you do choose to serve only delicious canapés, make sure you have excellent caterers who pride themselves in stylish presentation and tasty bites, and that you serve a substantial amount of food.