Each area is different. This has to be asked of your agent - because he/she is right there, in the trenches, every day.
In our area, 10% escrow deposit seems to be the norm. However, in the buyer's market,
(and you got to find out which market you are in - in the area you are buying) lesser percentage
could be negotiated as well.
Escrow amount is part of the offer - the more you offer, the more confident you look as a buyer.
Sometimes, you can negotiate a better deal with this being a factor (and there are other factors too).
Bigger escrow deposit could mean a lower price tag...
The con in putting more money down is the risk of loosing your escrow deposit.
However, this happens if you don't follow the contract timeline or requirements.
So, before signing, make sure to ask about your "exit" strategies and the important dates to go by.
Hope this helps,
Beachfront Realty, Inc.