There are a few people here that have those--Yuri, Kornkob, EdWort to name a few. Personally I would go with a keezer (freezer converted to a kegerator) because, depending on size, you could fit so many more kegs.
You are going to have to upgrade the tower and add faucets if you want to serve more than one beer at a time--I'm pretty sure you can fit 3-4 cornies in there.
My .02, but if you want some ideas, you can view plenty of kegerators in a dedicated thread somewhere around here.
EDIT:
http://www.homebrewtalk.com/f35/show-us-your-kegerator-29053/