I did this for ~90 people, but I didn't have kegs. Your way is better. But I'm not sad that I didn't buy kegs--those things ain't ch33p on a grad student budget, and there's no way I was gonna get the groom to buy them for me just for making the beer.
I would recommend bottling the best--something like a saison or a well-balanced stout--as a favor. The age will benefit either of those, and the guests get something beery to take home
I did a tasting line-up for my groom and bride of about 6 different styles, 'coz they weren't heavy drinkers. We had a few on deck already, and I brewed up 4 more.
What varieties were y'all thinking for the wedding?