Juliet,
I typically just put cash as it is taken more seriously. However, if you end up with a deal that you expect to close regardless, you'll need to let the title company know up front if it won't be cash. Otherwise, the normal processes will mess up, like title commitments, insurance, etc.
If you expect your buyer to close, then you will still have to work closely with the title company to leave the title policy and other items open, rather than making them do double the work and at the last minute.
You will normally have a separate contract with your buyer and it's not necessary to match your contract to theirs, so don't worry about guessing.