I've heard those are both high quality cases, but if you read the reviews on newegg, the fans that come bundled with the Aurora are a bit anemic. The P182 has more sophistication, having the lower chamber with independent cooling for the PSU, and then 2 exhaust fans above and behind where the processor should be. Overall, I'm betting the P182 is a better cooling solution, but they are still both very good cases.
CompUSA has the antec p180B case for $69.99 with free shipping or in store pickup. Looks pretty good for the money. Those deals generally sell out fast. I got my sonata II for $30 after rebate at Fry's.com, and it sold out in about 2 hours.