could that be because potatoes are vegetables? :wink:
really depends on what your family and friends regularly eat/cook. If you don't want something too fancy schmancy, but something that's not going to be 'westie' as your wife (sorry, wife to be) puts it then you should go for chicken (kiev?!) or beef (Steak!) cos they're pretty safe bets, and yeh, the 50/50 menu usually works well because then people can swap, and then just serve the vegos different meals especially...
also depends on when the wedding is, whether it's winter or summer will probably help you decide whether you want lamb shanks on mash or roast chicken and salad...