I think Brewer's Best makes a "American Micro Light" that would be good for a big mixed group of people.
My favorite kits have come from a couple of online suppliers. check out these:
NORTHERN BREWER: Ale Kits (Extract)
and these:
Austin Homebrew Supply or
Austin Homebrew Supply
Almost any beer you can think of is there! A couple of things to keep in mind- lagers are generally more advanced and require cold temperature control, so unless you have a lager set up, stick with ales. Also, dry yeast is quick and easy, so Nottingham yeast, S-04 and S-05 will do just fine until you have more experience. Stay away from cheaper dry yeast like Munton's, and you'll do well with dry yeast.