OK, throw a coin then. You won't go wrong either way.
I wanted a P182 myself, the only reason I didn't get it is because it was too small for an 8800 GTX and 7 hard drives. There's only room for 6 because the GTX is huge. With the GTS you have room for 8 disks, by the way.
If you are sure you won't need tons of disks I'd vote for the P182, it doesn't even matter if it cools better than the Aurora or not.
Lian-Li PC-V2000. I wanted to recommend it to you but it doesn't make sense. If you have $200 additional dollars you're much better off upgrading the GTS to GTX than upgrading the Antec P182/Aurora to a fancy case.