I got the SuperDrive.
I got Office 2011 for my new Air at BestBuy. And they have a deal where you get a free $20 gift card. So I went and got the SuperDrive for $60. Bestbuy still has it for $100, but they'll price match Apple's new $80 price tag.
The SuperDrive is really nice, and works like a charm... but it seems like it won't work on any other computer, which is lame. (I guess it doesn't "really" matter considering everything else has a DVD drive but still)...
It's something about the USB ports not being powerful enough? (which is weird because you would think the Air would have weaker USB ports if anything)
As far as cases go. I don't think i'll need one. This thing is build like a rock - even better than my MBP unibody. (the MBP is strong too but its a bit more "airy" and thus dents easier... the new MBA is so compact with the same metal unibody that this thing is solid)
BestBuy had all the adapters for $20... Might get the DVI and VGA ones as it might be useful every now and then.