1. if you can find the right Sanyo 4912 model 'dorm fridge' that will hold a couple kegs and your CO2 bottle, and you can drill through it and install a faucet.
2. you are thinking about keg's with a party tap...where you have to pump air in to dispense beer. you use pure CO2 on corny kegs. Air oxidizes beer. CO2 doesn't. My kegs taste as good (sometimes better) after being slowly consumed over 2 months, as the day I pulled the first pint.
3. call midwest and ask them what's different. looking at their website, both have a used CO2 tank, used ball lock keg, apparently the same regulator, and the same accessories. you may be paying more for quality, or just for the brand name.
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10