So let's think this through logically.
Buyer want's to pay the exact price of 1BTC for your domain right?
Most likely the person that tracks that price is a BTC owner themselves.
He also wants to buy a domain, which increases the chance that they are a BTC developer.
BTC developers tend to have amassed a fair amount of BTC.
Most people here would have sold BitcoinWallet for the same price, but the guy asked for $250k and got it.
Different times sure, but BTC is increasing in value once again and developers are looking to get into the space before another big surge that should come later this year.
The singular is worth more than the plural in this case, and I think the plural having a $10k price tag gives you a good position to at least start the conversation higher than that.
My point... ask for more.
More specifically, ask for what YOU want and what makes YOU happy. If taking $5k will always leave you wondering and thinking I should have asked for more, then you should have asked for more.
Me personally, I would ask for more. But, that's me.
Good luck!