Ask HN: What would you give up for The Killer Domain?

Let's say you're trying to build a well known consumer brand. Most of your traffic is expected to be word of mouth. You've found the best domain you can imagine. Something as good as Mint.com.

You've talked to the owner, and he claims to have had offers of hundreds of thousands.

I know what Aaron Patzer did in that situation. What would you do and why?

Let's assume you're 6 months old and have raised $1M angel round.