chart....
http://www.wilton.com/cake/cakeprep/baking/times/party_2inch.cfm
with their's 9 inch round (tho I think that's small and would do at least a 10)
there is NO agreed upon consensus.
it all comes down to how big a chunk of cake you serve.
wilton figures its 4 inches tall (height of tier) x 2 inches (depth) and 1 1/2 inch thick.
I would do a 10" round myself, about 4" tall after being torted and filled.
me too on the 10" cake. that's the size we used at daugher's baby shower. we had about 15-18 people and had just a little left over. It was the perfect size. (I cut them wedding cake size, because I set up a buffet, too. Plus cutting them wedding cake size is just an old habit! 
)
I think is better to use the 12" cake pan, so you will have enough cake and some leftovers. if it is for a birthday party, if it is for a wedding you can use the 11" x 4" . Grace
I would do a 10" round myself, about 4" tall after being torted and filled.
What Karen said! 
I know that a ten inch round is enough...but I'd do a twelve inch round so theres PLENTY.... 
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