Understanding what a Letter of Intent is and when to use them is a bit confusing. But basically, this letter just means you are serious about continuing towards a purchase and that you want the other party to stop entertaining other offers. Our Letter of Intent template is suitable for all states.
Go with one of the classics, because they're used for a reason. If you sound too stiff and formal, it comes off like a holiday card. If you reiterate your call to action, it can carry a whiff of desperation. Just get out gracefully and quickly once you've said your piece.