I keep a 1/2 keg in my fridge (it's a commercial-quality glass sliding-door Coke refrigerator that someone gave to me). It's definitely better tasting and cheaper to keep stocked. I swap mine out about every 6 weeks ($70 for Miller Lite, Killian's Red or $100 for Amstel Lite, Guiness, Fosters, Pale Ale, microbrews, etc.).
I don't have a CO2 unit on mine - I figure the least I can do to burn off calories is pump the thing a few times every time I pour a beer. Basically I have all I want to drink straight from a keg for ~$15/week. It doesn't last quite as long in the summer when everybody comes over and hangs out at the pool (about 50' from the keg), but it's still cheaper than buying cans!
I'll see if I can find a picture of mine. When I hosted some classes here in the summer, we all wrapped our bulletproof vests around it on breaks to cool them off. Of course it turned into some internet legend about how we'd rather protect the keg than ourselves, which was pretty funny....
Black Fox