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My answer is assuming you are going to have dinner afterwards. So I would say do 3-4 passed apps and then maybe a veggie and cheese display.The main thing is that you have enough of the options so that you don't run out. Oh and make sure that the servers keep their trays full and really work the crowd. There is nothing more irritating then having the apps be solely passed and then as a guest have to try and track down a server to get a bite or two.
There will be a 3 course dinner and late night snack to follow. Also a candy bar for guests. We'll make sure to address the app/waiter/guest ratios with the hotel so no one goes without during the cocktail hour. we will also have 2 stations of food during cockatil hour -- TBD on what kind of offering.