As has been mentioned - In terms of a complete setup you can't really go wrong with the Keg King. I have one and have not had any problems with it for the last 2 years. I will say they are very ambitious if they think they can fit 3 cornie kegs and the C02 bottle in there. Admittedly I have only tried to fit two ball lock and a pin lock in there and the pin lock kegs are wider, but I think I'll need to move the regulator and bottle outside if I'm really going to fit three.
For absolute simplicity and relatively competitive pricing, the Keg King website has everything that you will need to start a keg system.