My top three case swap beers, in no particular order:
Al's Northern English Brown
Bazza's Bitter
DB Weizen
All were beers I could drink a few pints of and that I'd definitely say were of medal winning standard if I were actually judging them against a style (though al's might have to change style to Brown Porter)...
Overall I was more than happy with the quality of the beer (and the labels, though some of the names could have done with some work ;-). Loved the whole process... getting the beer, photograping, sniffing and sipping, then just sitting back and drinking.
I'm amped about the next one and hope I can up the ante (I'm sure everyone thinks that to a degree).