I'm pretty astonished that Uerige is available at all in the US... I was workign in Duesseldorf this summer, and it was virtually unavailable in bottles, and on tap in relatively few bars. I also didn't really love Uerige, tasted a bit sweet and with noticable alcohol, I found.
Of the other...
Exactly. It's cloudy because it could hold more gas when it was cold (outside), then it can when it is warmed up (inside). It's free aeration for your wort.
You still shouldn't necessarily need a 2nd fermentation vessel - A lot of people on these boards to extract brews with hops/steeping grains, and do just fine with a 3+ week primary. It all settles out if you give it long enough. Lots of kits recommend 2 stage fermentation, but the only...