I agree with smokem... you cant really use the mini-fridge in its cooling capacity.. it will be too cold.. and it will draw out moisture.. so all you really have is a well sealed box.. that could be used for better purposes (like keeping your beer cold)...
I'd use one of your larger sized coolers..
or if you dont mind spending a couple of bucks.. there are a bunch of wine coolers on the DC craigslist of all sizes.. for less than $100 (some as low as $40).. If you watch CL closely, you can usually find a 12-18 bottle cooler for less than $40 (I picked up mine, new in the box, for $20 off of a lady in Richmond)....
For a very small investment, you can get the cooling capability, tight seal, and organization capability that a wineador brings... and not loose your beer fridge.. or your regular coolers.. (just my .02)...