A few things...
That's a Danby kegerator. I suppose with free shipping that's not a terrible deal, I suppose. But I bought mine for $430 at a local retailer (Best Buy). You will probably find that you need to do some cheap ($25 - $35) and simple modifications to it, however, to get it operating properly. But for $650, I'd rather just make a kegerator out of a chest freezer.
A 1/4 barrel is NOT a 20L keg. A 1/4 barrel is a 30L keg. The Danby will not fit two 1/4 barrel kegs. It will fit two 5 gal (20L) 'corney' kegs. Again, if you want two taps this is where the chest freezer advantage comes in. You can just buy a freezer that fits whatever you want in it. You can buy the 5 gal corney kegs on e-bay as well, but you'll need to buy a different connecter than the one that comes with the kegerator. For the 1/2 or 1/4 barrels, you're better off paying the deposit on them if/when you want one. The deposit is cheaper than buying, and the brewery owns it, cleans it, and replaces it with a new one if something happens to it at their expense.
Also, if you buy the kegerator and want two taps, you'll end up spending another $250 in parts because you'll need a two tap tower, a different regulator that supplies gas to two kegs, as well as an additional coupler.
You'll end up spending over $900 on this kegerator. For that kind of money... I would just you could buy this from this website...
Two keg tower premium conversion kit: $310.00
http://www.micromatic.com/draft-keg-...-LC-SGT-2.html
add on
5lb co2 cylinder: $56.95
E26 temperature controller: $59.00
For a grand total of ~$420 + s&h.
Then all you would need to do is find a freezer that you wanted. You will save money that could be well spent on beer.
HOWEVER, if you're set on the look of the kegerator, again, for that kind of money, I would just buck up and get one of these...
http://www.micromatic.com/keg-refrig...id-BM23-2.html
Because this is a high quality commercial unit that works like a charm out of the box and will likely last you 20 years.